Pivot Boxes
Use in Red Team pentest to conceal pivot boxes for MITMA "Monkey In the Middle Attacks"
Geo caches
Leave an item for someone that they need to get, but that you can't be there to give them. Covertly, discretely leaving packages for the right people to find.
Contraband Concealment
Dead Drop your Contraband before that illegal search and seizure. Turn the corner run and......... "Just drop it"
Covert Exchanges
Exchange information, usb drive, supplies while maintaing operational security
Surveillance
Use rock to conceal surviellance devices, Cameras.
Money Stash
Conceal Money in an everyday ordinary item