SEA TO SUMMIT Evac 35L Dry Sack

We Were The First Company To Introduce A Compression Dry Bag Into The Market Which Does Not Use A Purge Valve. This Innovation Uses Air Permeable Event® Fabric On The Base, Which Allows Air To Be Pushed Out Of The Sack, While Stopping Water Getting In. This Is A Lighter, Simpler And More Reliable Solution Than A Purge Valve. The Hd Model Is Built Using Extra-Tough 420d Body Fabric Features: - Valve-Free Design With Event® Cordura® Nylon Base: Compression For Sleeping Bags, Clothing And Other Compressible Gear. - Waterproof, Highly-Durable Hypalon Roll-Top Closure Secured With Our Field Repair Buckle. - Super-Strong, Abrasion And Puncture-Resistant 420d Body Fabric Keeps Contents Dry And Protected In Extreme Conditions - Strong And Secure Lash Loops For Attaching To Kayaks, Bikes, Motorbikes And Roof-Racks. Specifications: - Dimensions: 57.2 X 31.7 X 28cm/35 L - Weight: 370g Technology: - Event® Is A Proprietary Waterproof/Breathable Membrane Fabric. Like All Waterproof/Breathable Membranes, Its Micro-Fine Pores Allow The Passage Of Water Vapour, But Not Liquid. There Are A Number Of Waterproof Breathable Fabrics Available, All With Different Characteristics. Traditionally, Waterproof/Breathable Ptfe (Polytetrafluoroethylene) Membranes Got Clogged Easily By Body Oils, Which Rendered Them Useless After A Little Use. The 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 Avoided The Membrane And Just Used A Pu Coating. The Pu Has To Be Relatively Thick To Ensure Sufficient Waterproofing, Resulting In Even Lower Breathability. - The Genious 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. At This Juncture, Event® Is The Most Breathable Waterproof (20,000mm) Fabric We Know Of. It Is Sufficiently Breathable That A Pressure Gradient Can Force Air Through It. - We Use Event In This Way As A Purge Valve In The Bottom Of Our Evac Dry Sacks And Event Compression Sacks.