[FLEXIBLE STORAGE] Our 30L travel backpack fits a 15.6" laptop as well as all your essentials, including clothes, books, water bottles, and umbrellas. Expands to 42cm x 12cm x 32cm(16.5 x 4.7 x 12.6 inches) and rolls down to 38 x 12 x 32cm(15 x 4.7 x 12.6 in). [ROLL-TOP AND RELEASE BUCKLE] The backpack easily folds down to adjust the size and fastens with a sturdy buckle. Access items quickly and conveniently through the top or back zipper openings. [ROBUST MATERIALS] The roll-top travel backpack combines comfort and style with a long-lasting design. Made from highly-durable, waterproof fabric. Enhanced-strength zippers and buckle keep your items secure, while the breathable mesh s-curve shoulder straps and back panel provide comfort while carrying. [HOLDS EcoFlow RIVER 2 Series Portable Power Stations] Space to comfortably store and carry RIVER 2, RIVER 2 Max, or RIVER 2 Pro.