Antimatter Pack™

Style# 36604OR

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






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


Fabric 100% polyurethane, 40D main body // 100% nylon, 70D bag bottom and shoulder strap

  • 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

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)

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