This is a bike trunk for the back rack of any bike.
The trunk has a padded, insulated main compartment (interior dimensions 6 x 10 inches--enough for a six pack!) two more full length zippered side pockets, a smaller gear pocket on the very back. There's a slide in place for a U-lock and a shoulder strap to take it with you.
Pretty great, a little dusty because it's unused since I got a cargo bike with giant paneers, but otherwise perfect.