Utilizing waterproof shell fabric and fully taped seams, the Alpine Light(TM) Rolltop 30L is the result of a years-long design project with one goal-to create the best mid-size alpine climbing pack in the world. A step up from our original Alpine Light(TM) series, this rolltop version is eager to tackle your daring ice-capades head on, and is built with hyper-durable TPU-coated nylon to provide your essentials with the same level of ultralight, abrasion-resistant weather protection that you demand for yourself.