3F UL Gear Exhaustible Compression Stuff Sacks
15D nylon roll-top dry sacks with an air-release valve so you can compress a sleeping bag for packing. Compression typically lasts around half an hour before contents expand again.
Sizes commonly listed: 12 L (~48 g), 24 L (~63.5 g) and 36 L (~76 g) (Camping Depot / Nomali / Packstack).
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