The Function Backcountry Ski Backpack is a feature-packed backpack in an ultra-lightweight and compact design.This is the bag that put Function f(n) on the map by winning Freeskier's Editor's Choice Award for 2014. One of the key features of this bag is its Dyneema construction and Lifetime Warranty! What is Dyneema? Dyneema is a ultra-high-molecular-weight polyethylene material that has been dubbed "high performance" polyethylene. Essentially, Dyneema is an ultra-lightweight, paper-thin, water-resistant, nearly indestructible fabric which makes it the perfect ski bag shell. In addition to the Dyneema construction, this bag features an array of other premium features. Inside the bag you'll find a dedicated probe pocket, hydration pocket and hose sleeve, and large main pocket. Also inside are not one, but two goggle/stash pockets that are perfect for goggles, sunglasses, etc. On the outside of the bag there are multiple zippered accessory pockets that give you quick and easy access to frequently used accessories. One of the best features is a retractable diagonal ski carry system. This system lets you strap your board on vertically to the backpack quickly and easily. The backpack has a back panel t-entry that makes reaching objects deep in your bag super convenient. About Function f(n):Function is an up-and-coming ski and snowboard bag manufacturer out of Colorado, USA. With only a few years of business under their belts, Function has already received the highly coveted "Editor's Choice" award for their backcountry backpack in Freeskier magazine. This is an impressive feat that demonstrates just how special Function products are. What sets Function apart from others is their attention to detail and unwavering desire to build bags out of only the best material. Every Function bag is a product of countless hours of research and testing by avid backcountryenthusiasts.