Sea to Summit Ultra-Sil Day Pack (20-Liter) Packs down small so it easily fits in pockets, purses or luggage Simple, streamlined design making it light and low-profile (2.4 ounces/68 grams) Siliconized Cordura for strength and durability Bar tack reinforced stitching on all stress points Two-way zipper closure The Ultra-Sil Day Pack won the Backpacker Editors Choice Gold award, 2017 Packs down small so it easily fits in pockets, purses or luggage Stuff sack has an attached carabiner Simple, streamlined design so it&#039;s light and low profile Siliconized CORDURA fabric for strength and durability Bartack reinforced stitching on all stress points Two-way zipper closure Reinforced shoulder straps for increased carrying comfort Webbing daisy-chain attachment point can hold a bike light water-resistant products (such as the Ultra-Sil Stuff Sacks) are siliconized on both sides for ultimate packability waterproof products (such as the UltraSil Dry Sack are) siliconized on the outside and PU-coated on the inside to allow seam taping.