Rockgeist Mr. Fusion Seat Pack

USD $230+

Mr. Fusion is our modular waterproof seat pack with large-volume, removable drybag, centered around a svelte mini-rack, holster, and a dedicated seat post clamp. 100% waterproof, and with the snap of one buckle, it’s insanely easy to load & unload.  Pack your things off the bike, and never worry about wiggle, wobble, or sag.

The same holster will fit either a 12L or 15L max capacity drybag, depending on the trip and necessary volume requirements. The 15L is an extra large bag please check the clearance measurements to make sure it will fit. For reference it’s more than double our sewn Foxglove Saddlebag.

We offer machined collars to clamp the shaft of your seat post in sizes 27.2, 30.9, or 31.6 mm. If you have a smaller 25.4 mm seat post you can get a shim to size up to 27.2 from amazon. If you have a dropper post, select the seat post size of your dropper and you will receive a non-marking nylon clamp to attach to your dropper shaft. Nylon dropper collars for 31.6 droppers will be available late summer.


  • 4130 Chromoly mini-rack (built by Hunter Cycles in California, USA)
  • Full Hypalon lower holster section
  • Waterproof proprietary RF-welded 210D PU-coated nylon drybag
  • CNC’d 6061 aluminum seatpost clamps or non-marking nylon clamps for droppers shafts

Product Specs

Weight560 g
Capacity12 L
CountryUnited States