Porcelain Rocket “Albert”: Introducing the First Dropper-post Seat Pack

Building on the concept behind their popular Mr Fusion, Porcelain Rocket has been working on a new seat pack, one that’s dropper-post compatible — called “Albert”. Find out how it got its name and get a unique look into its long design process – trials that involved endless brainstorming, seven prototypes, and months on the trail – and at the production version, coming this fall…

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In late June of this year, Scott Felter, the owner of Porcelain Rocket in Calgary, sent us a photo of a radically curved Mr Fusion seat pack rack and an aluminum block with several holes and grooves machined in it.

“Looks smart” I said, not really understanding what I was looking at. These were the first whisperings we’d heard about a dropper seatpost-compatible seat pack. The function of the rack was intuitive: by curving the support rack upward toward the seat, it could mount in a way that would allow a seat post to drop unimpinged by the clamp. But the block was a still a real mystery to me at this stage.

  • porcelain-rocket-albert-seat-pack_screenshot_20161026-215130
  • Porcelain Rocket Albert, Dropper post seat pack
  • porcelain-rocket-albert-seat-pack_screenshot_20161026-215336

Weeks later, I received another photo: this time, the rack and block were installed on a seat post. But still, I didn’t quite understand how it attached. What was clear was that there was no clamp around the seatpost at all. Therein lies one of the most brilliant elements of Scott’s design.

The aluminum block, rather than clamping around some part of the seat tube, fits between the bottom of the seat rails and the seat clamp. Since the mounting point is effectively a shim between saddle rails and seatpost, it can safely be used with any saddle – including those with carbon rails – and most seat posts. Of course, subsequent versions of the (patent pending) mounting shim have been sleeker and more elegant than that early proof of concept. The production version splits the mount in two, using a small mount shim under each saddle rail, which will ensure a good fit regardless of small differences in seat post clamp dimensions, and allows the mount to slide further forward on most seat posts.

  • Porcelain Rocket Albert, Dropper post seat pack
  • Porcelain Rocket Albert, Dropper post seat pack

Porcelain Rocket Albert, Dropper post seat pack

My own involvement in the design process didn’t start until I finally realized what I was looking at, and how the mounting shim functioned. With my mind thoroughly blown by the ingenuity of it, I set to bombarding Scott with my notion of what might be the design constraints and objectives. Naturally, having had this on his mind for months, he was way ahead of my every thought. Nonetheless, it seems my enthusiasm counted for something, since I was eventually offered the chance to test what was at that time the only prototype for two weeks on the Colorado Trail. But that comes later.

Porcelain Rocket Albert, Dropper post seat pack

As with each iteration of the Mr Fusion seat pack, Albert’s metal pieces are made outside of Porcelain Rocket’s small Calgary shop. The chromoly rack component is built by Rick Hunter of Hunter Cycles in California, while the machined aluminum shims (and clamps on Mr Fusion) are made in a Calgary machine shop. The latter gets most of its business building custom components for Alberta’s oil and gas industry, where transactions usually start in the five-figure range, and multi-million dollar projects are not unheard of. Small one-off prototype items do not come cheap. The production version — of just the mounting shim alone — reflects a research and development cost of several thousand dollars, while the hardware for the first prototype made it surely among the most expensive seat packs to ever exist.

  • Porcelain Rocket Albert, Dropper post seat pack
  • Porcelain Rocket Albert, Dropper post seat pack

Porcelain Rocket Albert, Dropper post seat pack

Scott spent the month of August testing “Albert I” while bikepacking in Newfoundland. While he did not use a dropper, he succeeded in proving the viability of the general concept. A few design constraints came to light in this first prototype: first, side-release buckles were incorporated into each of the load-bearing side straps, just like on the Mr Fusion, and on Albert much higher force is placed on these side straps. Whether on Mr Fusion or Albert, the lateral forces (or “sway”) are taken care of by the rack – that lateral stability is what makes these seat packs some of the best available. But, the rack does not entirely eliminate vertical movement in the seat pack. Rather, the mounting bolts (at the clamp on Mr Fusion, and at the shim mounts on Albert) act as pivot around which the seat pack can rotate up and down. But, more so than on the Mr Fusion, Albert’s mount-point pivot is much closer to the back of the seat rails, where the side straps are anchored. As such, the weight of the seat pack is acting on a relatively longer lever, increasing the forces on the side straps.

Over one particularly hard impact, one of the side buckles on Scott’s early prototype exploded, and just like the namesake Albert I – the first primate to not-quite-make-it to space, who lasted only moments when the inside of his spacecraft depressurized – the seat pack met a catastrophic demise as it rotated into a spinning wheel.

It’s worth noting that the damage was much less severe than that makes it sound – the rack and mount were unharmed, and the damage was entirely field-repairable.

Though it was clear that the buckles were (a) a weak point and (b) not necessary, after Scott’s trip to Newfoundland, this element of the design didn’t actually change in round two. Rather, the changes made to the design that I’d test on the Colorado Trail, in September, reflected the fact that Scott’s first prototype was very difficult to construct. To address this, some small changes were made to how the side panels connect to the rack. Since the buckles hadn’t yet changed, Scott advised me to close the side-lock buckles with zip ties for insurance.

Porcelain Rocket Albert, Dropper post seat pack

Unfortunately, Albert II the seat pack fared only a little better than Albert II the space monkey, who really did make it to outer space, but met his demise at terminal velocity when his spacecraft’s parachutes failed to deploy. (The Wikipedia article about monkeys in space reads as a heart-wrenching tragedy…) Alas, the thin loops used to lace the side panels onto the chromoly rack needed to withstand higher forces than expected and they began to pull out of the seam. This however made it clear that the connection between side panels and rack stays was structurally important. As the lace-loops pulled out and the connection loosened, I found the vertical bounce of the seat pack became more and more severe. Initially, I’d been dropping my saddle about 110mm (leaving only 60-70mm between seat pack and tire), but in its semi-broken state it would buzz against the tire on bigger hits if I lowered it more than about 50mm. On descents, I was stopping every couple of minutes to tighten the side straps which would slip after so much bouncing.

  • Porcelain Rocket Albert, Dropper post seat pack
  • Porcelain Rocket Albert, Dropper post seat pack

Scott later admitted that he didn’t have a lot of confidence in the version I tested in Colorado. He was just sort of hoping that it would be sufficient. After all, it was sent my way on relatively short notice, and much of it was recycled from his own Newfoundland prototype. But still, this experience pinpointed the importance of the connection between the plastic-stiffened side panels and the rack rails.

My eventual field repair, after four days on the trail, worked by lacing the side panels together and around the rack through holes that I’d melted in the side panels’ plastic stiffener using a cook stove and a hot metal rod. The laces would loosen over time, with any slack working its way toward the bottom where the tension from the side straps was directed, and the vertical bounce would slowly increase. Still, by occasionally tightening the lace over the next ten days, the seat pack remained stable with a manageable amount of bounce. I was able to continue dropping my saddle – safely down by 80mm or so with the occasional tire buzz if I went a bit lower, leaving a bit more than 3” between the seat pack and tire.

Porcelain Rocket Albert, Dropper post seat pack

  • Porcelain Rocket Albert, Dropper post seat pack
  • Porcelain Rocket Albert, Dropper post seat pack

These two weeks in Colorado — the first time Albert had been used on a bikepacking trip in conjunction with a dropper post — also proved that Scott was on a righteous path. In short, bikepacking with a dropper post was completely revolutionary. Never had I moved so efficiently and enjoyed challenging riding on a loaded bike to that degree. The benefits of riding with a dropper seatpost on day rides on technical mountain bike trails are multiplied many times when riding long days, day after day, on a bikepacking trip. Having experienced it, I can’t imagine riding something like the Colorado Trail without. It can’t be overstated how life-changing this was, and it solidified my own commitment to the project.

A few weeks later, back home in Canada, I made a trip to Calgary to meet the guys at Porcelain Rocket and work with Scott of finalizing the design for Albert. Our first inspiration was to experiment with the use of Voile ski straps – those rubbery straps used for so much more than holding skis together – in lieu of nylon webbing side straps. The thought here was that Voile straps, once tightened and anchored at the buckle, cannot slip. It was immediately clear, however, that any amount of stretch in the side straps allowed for too much vertical bounce. Like Albert III the space monkey, this one didn’t even make out of the troposphere (or in this case, the workshop).

  • Porcelain Rocket Albert, Dropper post seat pack
  • Porcelain Rocket Albert, Dropper post seat pack

Porcelain Rocket Albert, Dropper post seat pack

  • Porcelain Rocket Albert, Dropper post seat pack
  • Porcelain Rocket Albert, Dropper post seat pack
  • Porcelain Rocket Albert, Dropper post seat pack

To resolve the issue, we decided that more robust nylon-webbing side straps, under higher tension would be the answer. By looping the strap from the rack, up to a plastic loop near the seat rails and back to a ‘tensionlock’ buckle, it acts as a 2:1 pulley system, cutting the stretch in half and doubling how tight one can get those side straps. A forward pointing pull-strap ending in a finger loop makes it even easier to get the side straps tight.

Back-alley tests had me dropping the pack to within 30mm of the tire and bunny-hopping aggressively with very little tire rub. With the merit of the “trucker hitch” side straps — as Scott likes to call it — proven , we set to improving the connection between the side panels and rack. In short order we tried several options: small Hypalon loop? Annoying to assemble. A single 500D cordura sleeve? Better, but it was bulky and still difficult to install the rack. A pair of 300D sleeves finished with ribboning? Very nice. The inner seam is double-stitched and the load widely distributed across the seam, insuring a much more resilient anchor for the side panels.

Now, back in the alley, I struggled to get the seat pack to touch the tire, even with only 30mm of clearance. Of course, I’d never recommend dropping the bag low enough to intentionally make it rub. The final product will come with guidelines suggesting to keep at least 50mm of clearance between the bottom of the pack and the tire, but the production pack is about 12mm smaller than the prototypes so this will be that much easier.

Long-legged people will always be able to drop their saddles more than the short-legged. Shorter individuals hoping to ride large-wheeled bikes, like high volume 29er tires, might have insufficient clearance for any amount of saddle drop. Tangentially, those riding bikes with very little seatpost exposed, who have lacked the minimum 6” (15cm) of exposed seatpost required to use a Mr Fusion, may be interested in using the Albert in its place. The minimum clearance for Albert to work will be communicated on the Porcelain Rocket webstore so that there will be no surprises.

Porcelain Rocket Albert, Dropper seat-post seat pack

  • Porcelain Rocket Albert, Dropper post seat pack
  • Porcelain Rocket Albert, Dropper post seat pack

The production version of Albert will look very similar to the final prototype that appears in these photos. I brought this one back to Vancouver for a bit more testing on rough North Shore trails. While rattling down the hill, the mounting bolts kept loosening from the threaded shim. In an effort to make them stay put, I over-tightened the mounting bolts and, by torqueing on them like a ham-fisted fool, I managed to bend one of the shim mounts. To address this issue, the production mount shims will not be threaded. A thru-bolt and a nylock nut will be used instead, so it will not be able to rattle loose. This will also greatly reduce the opportunity for anyone to push and twist on the mount like I did using a multi-tool. Note that the forces from the seat pack’s movement are comparatively tiny and almost entirely directed on the side straps, so the 7075 aluminum mounting shims are in no danger of bending under normal use.

Porcelain Rocket Albert, Dropper post seat pack

The first batch of Albert seat packs is expected to be available on www.porcelainrocket.com by mid-December, and will cost $230CAD (about $170USD with today’s exchange).

  • Max Volume 9 Liters
  • Weight 450g complete, including all hardware, and drybag
  • Price $230CAD
  • Availability Mid-December, 2016
  • Contact porcelainrocket.com

P.S. There were no monkeys harmed in the making of this product. – Skyler

  • Peter NIss

    Great insight. Innovation is not falling from the sky… it’ s a long way down a rumpy trail ;-)

  • Andrew Miauze

    It’s good seeing so many thoughts put into a bikepacking product!
    however, I am still wondering what advantages this has over a normal lightweight rack (e.g. tubus airy ~ 230g) with a drybag strapped to it …

  • If your bike can fit a Tubus Airy, that’s an awesome choice. I’ve personally been finding that I’m most comfortable/efficient on a proper trail hardtail for bikepacking, and usually with plus tires. These bikes rarely have braze-ons for rear racks, and the racks that clear 3″ tires are closer to 1kg…I find that most bikepacking-specific mountain bikes that come with the necessary braze-ons are trying too hard to be touring bikes at the same time, and I do not get on with the geometry. This seat pack sort of avoids that entire issue.

  • The Airy is nice. For me the plus side of this solution is that it can work on any bike with any tire size, and better yet, full-suspension bikes. I have a 34″ inseam, so their is plenty of room for a dropper and suspension.

  • Also, if your bike can fit a lightweight rear rack, you’ll probably be able to use the full drop on your dropper post no how tall you are. I can’t think of any down sides to that to that, if it fits. Really, this seat pack is an elegant work around that will fit just about any bike…

  • Ben Duncan

    Brilliant mate! Now about that frame pack..

  • Nicholas Tingey

    Really enjoyed reading this article. Keep them coming!

  • Garret Schmidt

    Great article, Skyler! Any plans to visit CO again soon?

  • Doug D

    I can see how this is going to make a difference for a lot of people. For me it has the reverse of the usual effect. I didn’t want a dropper post because I did want a seatbag, this makes me want a dropper post because I can have a seatbag.

  • Feidhlim Dignan

    Does this have any negative effect on the life span or service intervals of the dropper post?

  • This is an interesting question that we’ll continue to explore, and hopefully eventually write about in detail. I think certain dropper designs lend themselves to bikepacking better than others. For example, it’s easy to pull air into the hydraulic piston on the KS dropper I’ve been using by lifting the bike from the saddle if the dropper is not fully extended. The only fix for this is a new cartridge, and no matter how conscious I might have been of this issue, I still somehow ended up with a squishy seat post.

    I’m most interested in trying a full mechanical dropper, such as the RaceFace/Easton, for bikepacking, because if those posts fail, the post defaults to being fixed in place, rather than squishy or sliding down.

  • Hell yeah! We got snowed off the final 100 miles of the Colorado Trail, which I’ve heard are the best part. I’ll be back as soon as life allows. Such great riding!

  • Dave

    I rode what is basically the full-suspension version of this Kona bike on the Colorado Trail this year, and can attest that it would’ve been totally rad to have a dropper post + this.

    Albert is a pretty good name, but I still think it should’ve been called the James Brown (because it can get down)! :)

  • Peter Čavo

    I love my Kanga (Alpkit), i own also Sadle pack (Apidura), and that one? O.K. Good idea but overprized ?

  • Jeremy Deme

    Also curious about that frame bag

  • Yes…that’s another prototype…More details on that in the coming months.

  • swm

    Wish the production models utilized Voile straps like the prototypes. Vastly more useful out in the field.

  • Nick Balducci

    Very nice design! I am wondering what the packing volume of the Albert II is compared to other similar seat bags( Mr.Fusion/ Terrapin)? I am a smaller rider so I have to use a small bag to make it fit even without a dropper post. I want to be able to carry a larger amount in my seat pack.. The Albert II looks like it would allow the smaller rider to fit more gear even if they don’t want to run a dropper on their ride..

  • Nick Balducci

    Missed the volume metric in the article. Already have the answer I am looking for… 9 liters. Too bad, I was hoping to be closer to the 13/14L. of the Terrapin or Mr. Fusion.

  • Dalton

    Do you know if this will have enough clearance on a full suspension bike with the dropper post down all the way? I’m pretty tall so I might have more clearance than the average person, but I wasn’t sure if there would be enough room for the rear travel when decending.

  • The instructions on PR’s website state: “Requires 6.5″ between seat rails and tire (at full rear suspension compression, and at desired seatpost drop)”.

    To check, let the air out of your rear shock so that you can bottom it out, and see how far you can drop your saddle. Porcelain Rocket also sells Wolf Tooth Valais dropper spacers that can be used to reduce the travel of your dropper post, so that if, say, you can only drop 100mm out of a 150mm dropper post, you can make the dropper have a hard stop at that height.

  • Scott Felter

    Hey Nick,

    In order to make Albert a more ‘universal’ fit for a larger demographic of riders, we had to take the overall dimensions down a bit. 9L still allows for a fair amount of gear.

    The ‘short rider – large seatpack’ is the ongoing enigma of the bikepacking gear world. As noted in previous comments, there is nothing wrong with a nice, light rack and drybags, or small panniers. I use this setup on a regular basis myself…


  • Paul Heller

    Skyler, late but worthwhile note: keep the E13 TRS dropper on your radar. It’ll be full mechanical, with a metal spring for return. A whole lot less to fail in the field.

  • Chris

    any further developments on that frame bag?

  • Ed Pfromer

    Is anyone else using one of these? I’m bikepacking the Kokopelli with my son next month, and then the CT in July, and we both are on old-school triple ring Ibis Mojos with droppers. I’m considering this bag or maybe one from Ortlieb.

  • Nick Hamilton

    Just got done with my first trip using the Albert. REALLY want to love this bag, but as of now have more of a hate relationship with it. Is anyone else using this bag struggling to keep it high and tight under the saddle? I eventually had to rig up a secondary device to keep the Albert from dropping into the tire, even when the post was extended.

    Am I missing something here? The locknut/strap over the seat rails combo isn’t cutting it. Has anyone figured this out?

  • I just got back from a 4-day trip with mine and I’ve got nothing for you – I’d tighten up the side straps in the morning and it wouldn’t budge all day. And that’s using the one-off larger sized prototype I ended up with.

    Do you have the early version of the shims where the bolts thread directly into them, or the latest version with a through-bolt and a spacer between the two shims?

    Do you have a picture of how it’s mounted/packed on the bike?

  • Nick Hamilton

    Thanks for responding so quickly. It’s the new model with the through-bolt and spacer combo. My buddy Ian was running the same pack and we both had the same problem. I’ll attach a photo below. http://uploads.disquscdn.com/images/acd340bd6b6155de567ded045ae001623d0748d55163eddad1aa3a330a6766a4.jpg

  • The side straps are for sure laced over the seat rails? In your photo it looks pretty good, so I’m not sure how it could rotate into the tire unless the webbing side straps weren’t grabbing the seat rails.

  • Nick Hamilton

    Right. That was the difficulty. By the end the only way I could get it to stay up without rotating down into the wheel was to carry next to nothing in it. In the end I only carried my sea to summit EB1 quilt in it and then it didn’t move at all, but that thing weighs next to nothing. It was set up properly and the torqued to the max that seemed reasonable but it would not stay put even with the straps over the seat rails.

    In theory it should’ve worked without a problem. In practice I couldn’t make it work properly…

  • Anthony Bier

    it’s awesome, but won’t work with a USE sumo clamp on my favorite suspension seatpost, which is rather unfortunate as I got really excited when I saw this.

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