Antimatter Pack™

Style# 36604OR

There's something to be said for having a day pack in your larger luggage—like when you're walking over to a boulder problem half a mile from your campsite. The stuff-sack weight Antimatter Pack stuffs down into its own pocket so it's easy to throw in. Airy mesh straps keep it breathable when the going gets steep, side compression straps cinch down your load, and two water bottle pouches hold the day's agua.






  • Lightweight
  • Adjustable Shoulder Straps
  • Internal Pocket Doubles as Stuff Sack
  • Water Bottle Pocket
  • Compression Straps
  • Taped Seams
  • Seam Sealed


Fabric: 100% polyester, 40D ripstop with polyurethane coating main body // 100% nylon, 70D with TPU lamination bottom

  • 18L: 8” x 7” x 17” / 20.3 cm x 17.8 cm x 43 cm
    VOLUME /
  • 18L: 952 cu. in. / 18 L
  • 18L: 9.9 oz / 282 g

Avg. Weight (oz./g): 9.9oz / 282g (One Size)

Customer Reviews

Perfect climbing pack (Review by Chris)

I don't write a lot of product reviews as I'm pretty skeptical about the veracity of many reviews. But in this case, I just have to say something. For our specific implementation, that is, carrying our necessities with us on multi-pitch rock climbs, this pack is absolutely PERFECT! It weighs nothing and stuffs into one of its own pockets to easily carry in a crag pack to wherever we are climbing; it has multiple zip pockets and - a make-or-break item for us - a hydration sleeve. At the base of the climb, we take the hydration bladder out of our crag pack and slip it in this pack, throw a couple of packable rain jackets, sun screen, snacks, etc. into the various pockets, and the follower carries the pack. It is so light and compact whoever is carrying it instantly forgets it is there. Absolutely PERFECT. We ordered a second one just to have a backup on the shelf in case OR quits making this someday.

(Posted on 7/15/15)

wish I ordered two (Review by brygil)

As soon as I opened the box, my wife stole this from me. I was psyched to use it for a light weight climbing pack, carrying my shoes etc. up long routes. But my wife claimed it for grad school; computer, books and lunch.

(Posted on 7/13/14)

Write Your Own Review