The vanguard biin 37 is a sling type backpack capable of holding an exceptional amount of gear securely and organised carry small gear and other essentials in the separate upper compartment other features of the vanguard biin 37 sling bag include small pockets for accessories a water bottle holder and an organized strap system rr large gear capacityr upper space for toting small accessories and other gear r zippered front pocket organizes accessoriesr front lens cap pocket r water bott