This is one handy multi-use bag by Detours. A triple-threat poke that does everything from market shopping to bike commuting.
We went shopping and filled its thousand cubic inches like an old paper grocery bag. Stretched out the straps and we had a convenient market bag to load up with supplies. Pulled the adjustable padded straps on one side and slung it over our shoulders for a convenient backpack.
Later, we got back to the bike, tucked the straps away, unzipped the hanger pocket and attached the bag to the bike rack. A waterproof base keeps the bag dry from street spray from below and a removable rain cover protects the goods from rain above.
The bag has an interior laptop sleeve and other interior organization pockets as well as exterior side pockets. Dimensions of 11 x 5.5 x 15 inches provides loads of carrying space. Weighs about 1.8 pounds.