What Our Gearhead(R) Experts Are Saying:"I keep the Waterproof Packable 18L Backpack stuffed in my luggage whenever I travel because it weighs practically nothing, and I always end up needing it. The rolltop closure and sealed seams have kept my gear completely dry through some genuinely nasty weather, and the LiteCush straps are way more comfortable than you would expect from a packable bag."Some days the weather turns without warning, and some trips produce more gear than you planned for. The Waterproof Packable 18L Backpack is built for both, an ultralight technical daypack that keeps everything inside bone dry and then folds away into its own pocket when the adventure is over. At just 10 ounces, it costs almost nothing to bring along, and the personal item compliant sizing means it fits under the seat in front of you without a second thought. The rolltop closure with fully sealed seams keeps water out no matter how hard it comes down, while DuraGlide sealing zippers co-engineered with Zoom handle access points with the same weatherproof reliability. LiteCush shoulder straps are structured, padded, and breathable enough to carry comfortably over real distance despite the packable construction, and compression straps with buckles cinch the load down when the bag is not fully packed out. Dual external water bottle pockets, a high-vis interior, and anti-theft zipper loops on all external pockets round out a bag that punches well above its weight and its packed size. Built from 420D Bluesign recycled nylon and finished with Matador's Switchback Stitch, this is the packable daypack that earns a permanent spot in every bag you own.