This should be a fairly easy find along the FHT, and is even tick- and thorn-free (unlike many caches along this trail). You can even sit down while grabbing the cache!
You are looking for a contact lens holder with two lids and containers that is wrapped in camouflage tape. The left half is for the logbook; the right half is for very small trading items.
Please watch for muggles while you are here, and please make sure the cache is completely hidden from view when you put it back--it should be hidden under a little bit of mulch.
Good luck and have fun!