Keep the Outside Out Keep the contents of your Flex Capacitor dry when the skies open up. With elastic on the edges, this rain cover fits 25-40, 40-60, and 60-75L Flex Capacitor packs. Features Fits all sizes of Flex Capacitor backpacks Elastic for snug fit Taped seams for waterproofing Materials 100% polyester Tech Specs 1500 MM waterproof rating