Regular size is a metal .30 cal ammo can. I prefer Plano boxes over other locking containers, but I place caches for the long haul.

https://www.amazon.com/Plano-3440-10-Waterproof-Stowaway-3400/dp/B00469G31G/ref=sr_1_10?ie=UTF8&qid=1510066300&sr=8-10&keywords=plano+boxes

https://www.amazon.com/Outdoor-Products-Smartphone-Watertight-Clear/dp/B00VGEH12O/ref=pd_sim_200_4?_encoding=UTF8&psc=1&refRID=24EKNWJNJKHE8E4B4HTX&dpID=31KcpwQQdKL&preST=_SX300_QL70_&dpSrc=detail