When the chips are down, you shouldn't be worrying about your ammunition. PMC agrees completely and responded with their X-Tac line. X-Tac is tried and tested by military and law enforcement around the world. Each round is manufactured to the exacting specifications demanded by operators. Trusted by enthusiasts and professionals alike, PMC has left nothing to chance with the X-Tac line. Why do I need a Battle Pack? Battle Packs are used as a secondary form of waterproofing for your ammunition. This is great for storing or caching your ammunition for future emergencies or time at the range. The handle makes it easy to transport and convenient to take with you, wherever you go. So stock up and stack these in your basement or bury them by your cabin. Either way, the Battle Pack has your ammo covered. NOTE: While the 5.56x45mm NATO round will fit in a .223 Remington chamber, 5.56 NATO is a military round that runs at higher pressures, and is not recommended for use in .223 Remington chambers. Lock, load, and order today!