This is the game changer to your run! The 1.6 Liter Insulated Hydration bladder is low profile to reduce sloshing and it keeps your water colder for longer. No matter how hot the day is, you can be cool with this BPA free bladder with a high flow bite valve and large, easy fill opening. It's as simple as ready, set, go when you can slide your bladder into your favorite Nathan Race vest. Peak Performance Wear water that stays colder longer with the BPA free insulated hydration bladder that features quick release hoses for convenient cleaning and a faster set up. Compatible with other Packs/Vests: Pinnacle 4L, Pinnacle 12L, VaporKrar 12L 2.0, VaporHowe 12L 2.0. Slosh Free The low profiles, slosh reducing design is better than ever - so you can keep your water where you want it - compact to your pack or vest. Features: Low profile, slosh reducing Insulated bladder allows water to stay cooler (38% longer) High-flow bite valve Large, easy fill openings BPA free Quick release hoses for convenient cleaning One Size Fit