Hyberg Stuff Sack

The Hyberg Stuff Sack is an ultralight organizing bag made from Dyneema® CT2K.18, a material valued for combining low weight with high tensile strength. The seams are taped rather than simply stitched, improving moisture resistance over a standard sack, but this isn't a certified waterproof product — in heavy rain or submersion, don't expect the contents to stay fully dry; it's built more to shield gear from ambient dampness than to survive a dunking. It comes in three sizes — S, M and L — spanning 3 to 6 liters and 12 to 19 grams, so you can pick the size that matches what you're separating out, whether that's a sleeping bag, clothing, or electronics. The drawstring closure keeps things simple with no extra buckles to fiddle with. For ultralight hikers who like to compartmentalize their pack into smaller modules, this is a sensible way to cut the weight of a stuff-sack system while keeping decent durability — just remember it's water-repellent, not fully waterproof.