|Bottom boot. Ballistic nylon is a super abraision resistant fabric sewn to the bottom of the bag, which keeps the bottom clean and never wears out. Hypalon liner. A synthetic rubber material coated onto a nylon mesh. High abraison resistance and super flexibility make this lining very long lasting. Bottom straps. These two straps can be cinched and released depending on the space needed by the user. And they work with the bottom boot. Center divider. Sewn across the interior, this feature keeps the bags' contents near and organized. Made of 420 degree pack cloth.