Trek's Interchange Grocery Bag features Trek's Interchange mounting system for easy installation and removal from Trek's rear racks (sold separately). This trick tote is the perfect size for 1 bag full of groceries. In fact, it features built-in carrying handles, a zip pocket for your valuables and compression straps, so it's perfect for carrying into the store and picking up your groceries, too. It has a carrying capacity of 1,245 cubic inches.