Try our vest-style Hydration Backpack. Its lightweight, the ergonomic design delivers near bounce-free comfort and easy function. This vest pack features ample pockets inside and out, comes with a 2L anti-microbial reservoir with a rubberized bite valve with an on/off lever that clips magnetically to the pack, and comes with an insulated reservoir cover. Its safety features include an emergency whistle and night-time reflective strips. It has ample storage on the front, for phones, snacks, form-fitting water flasks, keys, and gadgets.