With a little bit of extra space inside your pack or a big enough exterior pocket (like those on our best-selling Windrider and Southwest packs), you can have hydration at your fingertips via an over the shoulder or hip belt attached hose. The Platypus Hoser 2.0L Reservoir has become a go-to with backpackers and thru hikers for this and many more reasons. When empty, it lays flat or rolls up without taking up precious space, and it’s made out BPA-free, BPS-free, and phthalate-free for a clean taste. Embedded silver-ion also protects the reservoir from mold and bacteria. Science and refreshment? A win-win in our book.