Sea To Summit 35L Evac , Beluga 23S2SU35LVCDRYBGSCAC

Design and Details Non-wicking Hypalon roll-top closure with patented field repair buckle Valve-free air permeable eVent fabric base allows soft items to be compressed Double-stitched and fully-taped waterproof seams Bluesign Approved recycled 70D nylon sidewall fabric uses a Non-PFC DWR finish 70D eVent face fabric is Non-PFC New base lash loop feature compatible with optional shoulder Sling Strap attachment Oval shape stacks and packs easily Lightweight high density weave waterproof fabric 70 Denier 210T nylon with a white interior polyurethane (PU) coating High density 210T weave gives the fabric a stronger tear strength and greater durability White PU coating reflects light and makes it easier to identify contents inside your dry sack PU coating to make two different versions of this fabric: 2,000mm (Nylon Stuff Sacks, Pack Covers and Compression Sacks) and 10,000mm (Lightweight Dry Sacks, eVac Dry Sacks and Dry Compression Sacks) waterhead rated eVent is a proprietary waterproof breathable membrane fabric with micro-fine pores that allow the passage of water vapour but not liquid Traditionally, waterproof and breathable PTFE (polytetrafluoroethylene) membranes glog easily by body oils, which renders them useless after a little use Solution was to add a PU backing to protect the PTFE membrane When thin enough, PU still allows vapour transmission but at a much lower rate Some manufacturers avoid the membrane and just use a PU coating PU has to be relatively thick to ensure sufficient waterproofing, resulting in even lower breathability Genius of eVent was to make the membrane oleophobic (oil repellent), meaning it wouldn't clog with oils, therefore didn't need the inhibiting PU layer Sufficiently breathable that a pressure gradient can force air through it eVent in this way as a purge valve in the bottom of our eVac Dry Sacks, and our Ultra-Sil and 70D Dry Compression Sacks