This canvas bag has zippered compartments and dividers to help you keep your things organized. And it's padded to protect your belongings. We found it's great for carrying everything you might need for a a day of exploration. It can hold a pair of binoculars, a field guide, a wallet, a phone, and a notebook or tablet, (and maybe a snack).
It is 13 inches long and 9 inches across and has an adustable strap.