Stuff you might use, like money, clothing, etc? Or do you never stop at all?
Like the full pair of Fox Gloves that I use as cold weather gloves; my husband found them cycling back from work.
He just recently found half a box of staples for his Senco staple gun--he'll use them around here for sure. He's brought home pairs of leather gloves and tools also.
I have found and dragged home jackets, many towels(great for the rag box) and once, when I was very thirsty, a sealed bottle of water--perfect timing!