The Amphipod AirStretch Trail Off Road Pack stores everything you need to stay light and prepared on rugged trail runs. It starts with the flexible AirStretch waistbelt, which moves with you for unrestricted mobility when you're covering technical terrain. The AirFlow back panel promotes breathability to keep your sweating to a minimum. The included Hydraform water bottle has a low profile, ergonomic shape to keep you more balanced and allow for comfortable carrying, and its Jett Squeeze cap makes it easy to take a drink on the go and won't leak. The expandable main compartment is bigger this year to fit larger smartphones and other accessories. A smaller, separated pocket stores your keys, cash, or ID, and two stretch side pockets hold gels and snacks so you can easily refuel mid run. You can stash a rain jacket or extra layer in the stretch bungee on the back exterior. When it comes to comfort and convenience on the trail, you can't beat the AirStretch Trail Off Road Pack.