These 20ml cache containers come with a water tight pink lid which has a special tab, insert the tab into the slot when you are ready to set this cache out, screw down the lid fully.  The first person/group to retrieve the cache has the rewardd of breaking the seal, reavealing them to be the real FTF's for this cache.  Each cache comes complete with a small RITR Paper logbook, and cache sticker already applied.

These are sold individually and each one measures 53mm x 33mm externally