I love this waist pack so much. This is a great fanny pack for on day hikes. It will easily fit four 500 ml (16.9 fl oz) bottles, a protein bar, sunglasses, keys and a phone. The waist band can be extended and shortened to fit almost anyone, with an easy click buckle. I like to wear it on my lower back while hiking, which is much less sweaty than wearing a backpack on a hot day. I don't attach it to my belt looks, so I can easily rotate it around my waist to the front if I want to access something in the pouch, and then rotate it back during hiking. It has three pockets, one big one for the water bottles, and two smaller ones that are both still big enough for a phone or wallet. The front pocket has a keyring inside.
The bag is made of sturdy material, dark (navy) blue, with sturdy zippers. I ordered this 5 years ago, took it on several 10 mile hikes, and it has hold up perfectly. I also like how it folds up completely flat, so you can easily take it in your suitcase.