When you need to compress volume without significantly adding weight, the Ultra-Sil(TM) Compression Sack is an excellent solution. Made from a 30D diamond rip-stop siliconized CORDURAA(R) fabric this compression sack is far tougher than its weight would suggest. Ideal for use inside your pack or travel bag when you need to compress clothing or bulky soft items to allow space for other essentials or fun holiday items. ASSORTED COLORS Highlights Best Use Internal pack organization of soft items such as sleeping bags or puffy jackets. Packability The 'compressed volume&'; in the specifications equals the difference between a fully extended and fully compressed Compression Sack. Most items will not reduce in volume by the listed &';compressed volume&';. For example, a synthetic sleeping bag stuffed into a M Compression Sack may compress down from 14 to 9 Liters. What this bag could hold 6 Liter: a layer, beanie, and gloves 10 Liter: a puffy jacket & a compact sleeping bag 15 Liter: Most three-season sleeping bags, including synthetics 20 Liter: Most four-season sleeping bags (except synthetics) 30 Liter: Sea to Summit sleeping bag and your extra layers, or a less-technical cold weather sleeping bag Features 30D Diamond Ripstop Siliconized CORDURA 4 straps for even compression Extra long straps so these sacks can really be filled to capacity Bar tack reinforced stress points Pull handle on the bottom Slippery finish for easy packing FAQ&';s IS THE ULTRA-SIL COMPRESSION SACKa |? Waterproof? It is only water resistant. The seams are not tape sealed, and the top does not utilize a roll-top closure. Suitable for bikepacking? Not if it will be carried externally. If it is inside a bike bag, fine - if not, the 30D fabric may be damaged by contact with sharp or abrasive surfaces. We would suggest the eVent Compression Dry Sack as a handlebar bag. A good choice for a tent storage bag? Perhaps. Carrying the tent canopy in your pack (with the poles under the compression straps) is a great idea. However - the canopy may not compress that much. An Ultra-Sil Stuff Sack may be more appropriate.