Nathan Hydration Running Vest with 2L Bladder - Lightweight Breathable Backpack with Bite Valve, Phone Pocket & Storage - Perfect for Trail Running, Hiking & Outdoor Adventures

I love this hydration pack! I've got a pretty small body frame so the adjustable straps were really nice in finding a positioning fit that works with my arm stride. It took me a few adjustments tonget it right because I'm really particular about not having my arms come in contact at all with the front pouches, especially when it's my long run days. The pack itself snugs nicely in the upper part of my back so it hasn't thrown off my running form at all. I definitely have some sweat buildup on my back, and I would imagine this isn't fully preventable when wearing any sort of hydration pack, but the material is pretty breathable and it isn't distracting. The front chest strap is not only adjustable width-wise but it can slide up or down so you can position it around your breasts.Since getting this pack, I've put in about 50 miles total while wearing this and haven't had any chafing problems. The straps don't shift with the weight of the water pouch and there really isn't any bouncing issues either. The front zip pouch is perfect for a couple of gels and there is a net pouch in front of that where I put my little stick of body glide (gotta love having big thighs.) The other bungee pouch on my right is where I typically put my phone (Samsung s7) and it never budges when the bungee is cinched down. The large compartment where the water pouch is doesn't have much room for more than a full pouch, but if you're not looking to fill it to capacity, then you can probably fit a post run t-shirt and hand towel in there, but I typically keep those items in my car or in my check bag for after racing anyways. The smaller zip pouch at the top is roomy enough for your wallet and has a clip for your keys, which I think is supposed to minimize bouncing but they're going to jingle whether you clip them or not.I've really only used this for running and I think it's fantastic. I would imagine if you are out on a long walk with your pup or a hike it would be suitable as well.