Abstract: A packaging system for explosives having a thin walled water resistent tube containing a low-sensitivity explosive therein. A first cap is fitted about one end of the tube and has a re-entrant portion that projects into the tube about which the explosive material is filled. The other end of the tube is sealed with a second cap to create a substantially water-tight explosive package. An initiator is received within an open-ended cavity formed in the re-entrant portion of the first cap and is detonated for setting off the explosive charge.