All that time I could have sworn towels were smaller than sleeping bags in Rust, turns out that they're actually a smidge bigger! Or at least they currently are, maybe they were patched at some point. The hitbox reveals it! It's also odd their hitbox is a little sunken into the foundation. It also seems like the physical offset you feel when stepping on a towel is the same as a sleeping bag, though that's harder to tell and not explicitly shown when turning on colliders for the hitbox.
▬▬ sigbog.com ▬▬