Longer climbing trips call for organized packs, and we recommend the Uberlight eVent stuff sack ($39–$49, granitegear.com). Incredibly light (0.5 oz. for the 7-liter size), it’s made of Cuben Fiber, a sailcloth originally made for World Cup racing boats. This makes the sack about three times stronger than comparable nylon sacks. The transparent Uberlight has a waterproof roll-top closure, and a vent on the bottom makes it easily compressible. Although we don’t recommend dragging this across rough rock, it did prove virtually puncture-proof.