Sprinter is here---meaning there is still snow on the ground -for long runs…and no water fountains are on- or available (depending) to quench thirsts... Portable liquid solutions (convenient and necessary)-for those on the go-include, handhelds, running belts, and vests with hydration holders-plastic bottles or bladders. IMO-what to drink is just as personal as how to haul it all. interior stretchy pocket-keeps stuff dry like id card or cash. For us that means a metro card for NYC runs-in case we fade… WHAT we use when its warm enough out to sweat…therefore need more liquids -which in our case is water-is helpfully satiated by a FITLETIC solution…a company we saw at a tradeshow-that offers a bunch of carry options-for electronics, personal stuff, water etc. silicone grippers eliminate bounce dual adjustable belt and stretchy--with a hydration add-on Window armbands-keep weather/sweat out- synch up via bluetooth-all those smart watches/smartphone...