Porcelain Rocket Mr. Fusion V2: 5,000 Mile Review

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This seat pack has seen a lot. After 5,000 miles and some tough love, it’s time to give the Porcelain Rocket Mr. Fusion V2 the long-haul review it deserves…

To be clear, we’ve actually tested three Porcelain Rocket Mr. Fusion V2 seat packs: a pre-production sample, the gently used blue one, and the high mileage green that’s shown in most of these photos. By gross estimate, it has about 5,000 miles on it—hard miles on the Trans-Uganda, the Congo Nile Trail, the Altravesur, as well many other routes in the US including the TNGA. It’s been used on five different bikes. It’s had a wide assortment of stuff strapped to it, including shoes, papaya, firewood, jackets, a bottle of wine, and Spanish pastries. It has grease stains, and the logo is bleached white from hundreds of hours under the equatorial sun. It’s survived falls and being tossed around on a bus. It’s been grabbed and pushed by hundreds of Ugandan children. It’s been packed and unpacked countless times. To say that it’s been thoroughly tested is putting it mildly.

Porcelain Rocket Mr. Fusion V2 Long Term Review

  • Porcelain Rocket Mr. Fusion V2 Long Term Review
  • Porcelain Rocket Mr. Fusion V2 Long Term Review

Bikepacking Pack List and Gear

Rack the boat.

Before we dig into how well it fared, here’s a little background. The Mr. Fusion is a different kind of seat pack. Unlike others currently on the market, it is designed around a minimal rack structure. Purists might question the use of a rack for a bikepacking style ‘soft’ seat pack. Doesn’t a rack just add unnecessary weight and bulk? To answer that simply… No. The system offers benefits that far outweigh any extra heft, which is actually negligible due to the thoughtful design.

The idea behind this unique system was initially conceived in August of 2013 while Scott Felter, Porcelain Rocket’s ringleader, was fatpacking the Canning Stock Route in Australia. According to Scott,

The concept came from the frustration of packing things into a seatpack while it was strapped to a bike. A rigid strut made a lot of sense as a support for a quick-release, pack-off-the-bike system. It also made heavier, odd loads more practical on the rear of the bike.”

The mini-rack consists of a CNC machined aluminum seatpost collar bracket that slides onto the seatpost. The brackets are available in three sizes (27.2, 30.9, and 31.6mm). This clamp houses a stainless steel thru-bolt that anchors the 4130 chromoly loop support that is crafted by Hunter Cycles in Santa Cruz, CA. To carry the load, the lower harness (aka “gear saddle”) is stretched over the loop support as tight as a drum. The gear saddle acts as the lower portion of the harness with three compression straps (two on the side and one at the rear) and the male acetyl buckle ends.

Porcelain Rocket Mr. Fusion V2 Long Term Review

  • Porcelain Rocket Mr. Fusion V2 Long Term Review
  • Porcelain Rocket Mr. Fusion V2 Long Term Review

What’s New?

The new Mr. Fusion (V2) utilizes a similar lower rack and saddle structure as the original design. The chromoly support got a little bend in its profile, which helps cradles the load, as well as a new gray paint job. The top harness and bag itself have been completely redesigned. The upper harness on the original Mr. Fusion system was made of a single piece of fabric and two side straps that connected to the rack saddle. A rear strap held the bag in place. The stitched X-Pac roll-top bag slid into the system and had to be attached directly to the seatpost with an integrated front velcro strap.


The first pic taken of Scott’s original design of the Mr. Fusion. Below (from left): Cass Gilbert’s early prototype, somewhere in South America; Gin showing off her PR bags; The a later version of the V1 shown next to the Revelate Terrapin.
  • porcelain-rocket-mr-fusion-v2-review-42
  • porcelain-rocket-mr-fusion-v2-review-44
  • porcelain-rocket-mr-fusion-v2-review-43

Now, with the switch to a dry bag and a fully redesigned harness, it’s much easier to slide the bag in and out of the rack. The upper part of the harness has two reinforced side panels which are made up of HDPE plastic sandwiched between two layers of 500 denier Cordura. The panels taper at the front and serve to contain the load and create the streamlined shape of the pack. Each is stitched to a burly Rhinotek panel at the top and front. A webbing strap that is bartacked to the top holds the female acetyl clip ends that thread through the seat rails and buckle to the straps on the lower rack ‘gear saddle’. Two compression straps hug the sides and work with the HDPE to shape the load. Then, a single compression strap battens down the rear of the bag.

Porcelain Rocket Mr. Fusion V2 Long Term Review

  • Porcelain Rocket Mr. Fusion V2, bikepacking seat harness
  • Porcelain Rocket Mr. Fusion V2, bikepacking seat harness
  • Porcelain Rocket Mr. Fusion V2 Long Term Review
  • Porcelain Rocket Mr. Fusion V2 Long Term Review
  • Porcelain Rocket Mr. Fusion compared to Revelate Terrapin

Wag Proof. Sag Resistant.

It turns out that a lot of benefits can be packed into a small rack. Not only does it make packing a lot easier, it has a few hidden perks. When it was released in 2014, Mr. F was universally received as the perfect solution to what bothers a lot of bikepackers… ‘tail wag’, or a soft seat bag’s tendency to move back and forth due to instability. Scott’s response:

Honestly, stability was not really what sparked the idea. Stability was just a happy casualty of the design.”

  • Porcelain Rocket Mr. Fusion V2 Long Term Review
  • Porcelain Rocket Mr. Fusion V2 Long Term Review

Porcelain Rocket Mr. Fusion V2

No matter the intent. With a simple two-piece rack system at its heart, the Mr. Fusion combines the stability of a traditional rack with the low profile design of a modern seat pack. And, all of that comes in at an unbelievably low weight burden. With the rack, seatpost clamp, and upper/lower harness weighing only 370 grams, the weight of the entire system is comparable, and even lighter than other seat packs in the fully waterproof category. The total weight of the Mr. Fusion V2 system is right at 453 grams (16oz), while the Revelate Terrapin weighs 496 grams (17.5oz) and the new Ortlieb Seat Pack is 430 grams (15.2oz).

In contrast to fully soft bags, which tend to sag when heavier contents are added toward the rear of the bag, the Mr. Fusion can be loaded without overthinking weight distribution. The strut supports almost the entire length of the bag.

Lightweight, load stabilizing performance aside, one of my favorite things about the V2 is its unintentional capability of carrying some odd-ball items. This is especially beneficial on long trips when having a little extra space is key. While bikepacking in Africa this past winter, we strapped our spare tubes to the rack using electrical tape. You can also place flat items within the harness under the drybag, such as as a ground cloth for the tent or a tarp. Also, with its slender size and added support, it’s possible to strap things to the sides and top, such as a pair of Crocs.

Porcelain Rocket Mr. Fusion V2 Review

  • Porcelain Rocket Mr. Fusion V2
  • Porcelain Rocket Mr. Fusion V2 Long Term Review
  • Porcelain Rocket Mr. Fusion V2, bikepacking seat harness

Fully Waterproof.

The dry bag itself was a major advance in the Mr. Fusion V2 system. It’s 100% waterproof, whereas the X-Pac version on the original was only water resistant—a big difference when you are carrying clothing, a down sleeping bag, or electronics. Even when seam-sealed, most fabrics, X-Pac included, can ‘wet out’ with enough rain and wick water to the interior of the bag. According to Scott:

Building a system that was 100% waterproof was always the final objective, but due to the need to outsource RF-welding, it took until V2 to realize that. As the system progressed through prototyping, I was pleased that weight could still be kept minimal while still incorporating all of the important features I was looking for in a seat system.”

To solve this, the V2 was built around a Radio Frequency (RF) welded air-tight drybag. RF welding is a technology that uses electromagnetic energy to join waterproof fabrics and eliminate the need for stitching, which creates points where water may enter. The drybag is constructed out of 210 denier polyurethane coated nylon fabric. It doesn’t feel quite as rugged as materials used on other fully waterproof bags, but it held up fairly well over 5,000+ miles of abuse. Although it is showing only a couple pinholes from thorns and bushwhacking. While a slightly thicker fabric would be a welcome addition to the Mr. Fusion system, repairing it is easy with an off the shelf repair kit such as Tenacious Tape, easily found at REI, MEC, or any local camping supply store. Right now there aren’t too many fully waterproof seat packs on the market, the aforementioned Revelate Terrapin and Ortlieb being the other two big contenders.

In addition, at 8-13 liters, the Mr. Fusion V2 drybag is the perfect size. By packing lightly and cinching the top and bottom harness, it can take on a narrow girth, which is a nice benefit for use with full suspension bikes. It can also be packed short for lighter loads, or long for bigger trips.

Porcelain Rocket Mr. Fusion V2, bikepacking seat harness

  • Porcelain Rocket Mr. Fusion V2, bikepacking seat harness
  • Porcelain Rocket Mr. Fusion V2, bikepacking seat harness


  • It’s the most stable seat pack out there, period.
  • As mentioned, the Porcelain Rocket Mr. Fusion V2 can also be packed without mulling over how the weight is distributed, with no sag.
  • It’s a vertically slim pack, so it even works for shorter riders with limited space between the tire and seatpost; it’s really the perfect size, in my opinion.
  • Off the bike unpacking and repacking.
  • Simple harness loading and unloading.
  • The ability to carry other items such as a tent ground sheet or an innertube under the rack.
  • It’s available in an array of colors (black, red, gray, multicam, and multicam black).


  • At first I wasn’t a fan of having the velcro at the end of the drybag, but it eventually grew on me; some might still find it annoying, but ultimately I appreciate that it can be thrown around camp without being rolled, and still keep the bugs out.
  • Another grouch is that the side pull straps could be an inch longer; however, I mentioned this to Scott and it’s already been implemented on the current batch.
  • I wish there was some fuzzy velcro on the driveside harness panel; after a while the seatpost strap curls up as it’s not really anchored.
  • The dry bag doesn’t seem quite as burly as other waterproof seat packs in this class; after a lot of rough use, it developed a couple tiny holes holes (probably thorns or sticks… it’s been through some bushwhacking). It’s an easy repair with Tenacious Tape though, and ultimately, it’s held up through a lot of rugged miles.
  • Weight 16oz (454g)
  • Capacity 5–13 liters
  • Place of Manufacture USA and Canada
  • Price $185.00
  • Contact PorcelainRocket.com

Wrap Up

The obvious benefits of the Mr. Fusion V2 system are clear. It’s one of a few on the market that’s completely waterproof. It’s arguably the most easy to remove for off the bike unpacking and repacking. With the rigid rack and the well designed compression points, there is absolutely zero lateral movement in the system, even on the rough stuff. And it’s also incredibly versatile in the fact that items can be included in the harness or strapped onto the underside of the rack. Some folks might be skeptical of using a rack, as minimal as it may be, with a bikepacking setup. But the Mr. Fusion V2 is just as light as most others on the market and its functionality and minimalistic design should speak to the ultra-endurance crowd, weekend bikepackers, and expedition dirt tourers alike.

We review a lot of seat packs here, and I often get asked, point blank, “So really, which is your favorite?” That’s always a hard question as there are so many great products out there. And, it’s based on opinion. But I can honestly say that out of all the seat packs at my disposal, the Porcelain Rocket Mr. Fusion V2 is the one I reach for most.

  • Porcelain Rocket Mr. Fusion V2, bikepacking seat harness
  • Porcelain Rocket Mr. Fusion V2, bikepacking seat harness


  • Kristoffer NRJ

    Scott. Let us know when/if the cons have/will be/been addressed! Then we will buy a couple :-)

  • http://www.bikepacking.com/ BIKEPACKING.com (Logan)

    All products are going to have cons in a thorough review; you might be waiting forever ;) … If it’s the dry bag durability that you take issue with, know that I am still using it and probably will for some time. Also know that it’s easy to replace the drybag; that’s the cheapest part of the system.

  • Smithhammer

    PR gear looks great, if you can get it – the extraordinarily long wait times (and now I see they aren’t taking any new orders at all…) has pushed me to other options. That’s great for them that they apparently have all the work they want, but it seems the only people who can get their hands on PR stuff anymore are people who are planning their gear needs 6 mos. or more in advance. Personally, I’d be inclined to do that, if there weren’t other really good options out there that I can easily get in a reasonable amount of time, even when custom ordering.

  • Scott Felter

    I can appreciate your frustrations.

    Though, I assure you it has nothing to do with having “all the work they want”. It has everything to do with demand, and a commitment to staying small, while keeping quality high. We have experimented with outsourcing (like many bigger brands do almost exclusively), and have been disappointed with the quality and attention-to-detail. This is not something I’m willing to sacrifice, just to get gear out to more people. I pride myself and the PR brand on having the fingerprints of myself and Tim on each and every piece of gear that bears the PR logo. If you think about it, there aren’t many products in our world anymore, that you actually know who made that ‘thing’.

    The reason we are not accepting orders currently, is that I myself am actually going on a big fatbike trip for the month of August, and this will cause a significant lag in the build stream. I’d hope that you could appreciate that good things come from such experiences, and that this actually builds more authenticity into a brand. Can you imagine buying a custom bike from someone you knew didn’t actually ride?

    I’m particularly proud of the Mr. Fusion design, as I feel it represents a significant innovation in the short history of ‘bikepacking’.

    6 months is a bit of an exaggeration. We typically run a 12-week lead time on custom gear, which I admit is a long time to wait for something. That said, we are not the only boutique gear builder with such lead times. Trust me, I’d love to work less…

    There are a few other very talented builders out there turning out high quality gear, in shorter lead times. That means there is something there for everyone. It’s a fine time to be a bikepacker.

    I’m proud of what we produce, and I’m insanely humbled and honoured with the amount of folks who have committed to not only waiting for our gear, but also trusting it to some of the biggest adventures on our planet. I hope this comes through in the gear that we turn out.

    Thank you, Logan.


  • Andrew Wracher

    Well said Scott. Congratulations on a great review from a trusted source and a beautifully designed, innovative product.

  • TD

    Scott, what’s the best way to get a hold of you? I’ve been trying through the normal channels with no avail? Thanks!

  • Scott Felter


    I get lots of emails each day, and occasionally I miss one or two. And unfortunately, I will skip an email if the answer is available on our website.

    I apologize if I missed any emails from you!

  • Kristoffer NRJ

    I love everything about this product. I was actually only thinking on con 3 :) The little added fluffy velcro!

  • Smithhammer

    Scott – I appreciate your reply, and I agree with all of it. I’m glad to hear that you aren’t willing to sacrifice your standards just for growth – you are correct that this is an all too rare approach these days. It’s just tough when I see so many great reviews of your gear, yet none of it ever seems available. But hopefully some day, I will own some PR gear. Have a great trip in August, and I hope you’ll share your adventures. It is a fine time to be a bikepacker, indeed.

  • Scott Felter

    Thank you for the candid reply!

    And just as a clarification, with the exception of times when we close orders due to adventures looming, our gear is always available. It’s simply a matter of getting your name in our queue, and having a little faith and patience. I understand that in our North American “have it now” culture, this asks for a bit of a shift in one’s expectations and ways of thinking. However, there is something so gratifying about receiving a piece of craft that you’ve wanted and waited for. I hope so, anyways…

    Thanks again!

  • Smithhammer

    Cool. And just for the record, I’m not coming from a “have it now,” instantaneous gratification perspective – most of my bike bags (and a number of other items I regularly use) are custom, and have involved wait times. There is definitely something gratifying about receiving a piece of craft that you’ve wanted and waited for. .;-)

  • http://www.offroute.ca Skyler

    I just trimmed the excess velcro strap with some scissors…Not much of a ‘con’.

  • http://www.bikepacking.com/ BIKEPACKING.com (Logan)

    Yeah, for some reason I thought i might need that extract Velcro one day, plus it would add little bit more of an extra secure feeling.

  • Rockin’ Robin

    I’ve been looking at many, many alternatives to traditional touring. I find the ability to completely remove the bag from the harness cannot be over stated enough. It’s a well thought out design. I’d love to use one but seems difficult to get. Guess I’ll have to wait.

  • Justin

    How much extra weight would you reckon the rack/seat pack could withstand assuming the dry bag is already full? Could you reasonably drape something like an MSR Dromedary bag with maybe 3 liters of water over it, or a bag of fruits, or strap an additional 5 liter dry bag on top?

  • Doug D

    I have done exactly that, and though it is definitely not on the approved use list, It hasn’t broken mine. At some point, you will be putting a lot of stress on the seatpost. The extra weight isn’t as severe as an ass bouncing on the seat, but all posts have their limits. I have bent a few in my life.

  • http://www.bikepacking.com/ BIKEPACKING.com (Logan)

    Agreed. The removable drybag is awesome.

  • http://www.bikepacking.com/ BIKEPACKING.com (Logan)

    Yes, what Doug said. And, keep in mind that the rack does offset weight, but given the rotational point of the bracket, the rack moves under weight and the saddle rail straps also contribute to supporting the weight.

  • Dave

    How much volume can this fit compared to something like a Revelate Designs Viscacha? I’ve seen pictures of the Viscacha stuffed to the max and it looks enormous, though the specs say it goes up to 14 liters, which is only 1 liter more than the Mr Fusion, but it looks so much bigger.
    Has anyone used both that can offer an opinion on this?

  • gc3indc

    It would be great…if you could actually buy one!

  • siddhu

    I wanted to get set up with the Porcelain Rocket stuff months ago – in the fall of 2015. However my questions were never answered even though I sent mails to two different e-mails, tried Instagram, Facebook, etc! I patiently waited but no responses then I hear that all orders are closed. No matter how great the reviews are, communication with interested potential customers is non-existent and that’s a total fail in my book.

  • Scott Felter

    Not at all true. You sent one email on January 12th, which I replied to, but your email address was entered incorrectly, so the email bounced back to me. I did try.

    I have no record of an Instagram DM from you (not the best place for business discussions anyway, ATMO), and we have no Facebook page.


  • siddhu

    I used Instagram as I was trying every means to reach you. Secondly I’m not the first person who has had problems to reach you. Thirdly I used the contact mail that was on your site and then when that was not answered, I used another mail . This other mail address was found on a discussion in a forum about how to reach you. So before you slag me off you should be aware that you are building reputation as a brand that his difficult to communicate/reach.

  • Scott Felter

    I am sorry that you are so disappointed and apparently angry with us. That’s the last thing I want.

    I did attempt to reply to your email, but as a small business owner, I shoulder lots of responsibilities; at some of them I succeed, at some I fail. As a human, I make mistakes. I do sincerely apologize if one of those mistakes cost us your business. I do not intentionally ignore emails or correspondence. Email volume is ever-increasing as the popularity of our brand and the industry as a whole grows, so it is impossible to respond to each and every email in a manner that I could years ago.

    I’m not sure what else to say. I failed you, and for that I am deeply apologetic.


  • siddhu

    There’s no anger on my part, just bummed that I was not able to get set up with PR bags despite my best efforts. Best of luck to you as I do think your products seem to be class leading.

  • Gadgets Gear Travels GGT

    185$ really? I will make it bellow 50$ by my hands ).