Weatherproof Backpack | Pelican Mobile Protect Backpack - MPB20 (20 Liter) WATER RESISTANT SHELL: Durable water resistant coated 1000D nylon outer shell WATER RESISTANT ZIPPERS: Polyurethane coated YKK zippers to help fight water intrusion. Unique loop and lock zipper pull system featured on laptop and media pockets SHOULDER STRAPS and PANELS: Compression molded EVA shoulder straps and back panels for egronomic comfort and drop protection COMPARTMENTS: Large main compartment with laptop sleeve. Vertical pocket for quick access. Side pockets with tuck away attachment loop WARRANTY: Lifetime. You break it, we replace it  forever!