This was a Tupperware picnic insulated back pack, but it lost the bottom section (see picture where the zipper is). So did you lose the top section of yours, but still have the bottom? Maybe they could meet up! Or you can just use it as is, as a regular backpack. It has a smaller insulated tote that goes inside.
Pick up near Brothers of Mercy in Clarence, NY. If you include your phone number in your message to me, I will call/text you with pickup information.