3V Gear Scout 2L Hydro Tank - Hydration Reservoir - Compatible with Camelbak and Other Hydration Packs. 2.0 Liter; Metallocene PE high strength & taste free film (BPA, Latex & PVC free). Tough construction for maximum abrasion resistance. Easy-to-use 3/4 turn 53mm (2") Fill Port. Patented Bullet "Bite Me" valve. Anti-microbial bladder interior and drink tube to prevent bacteria and mold.