I keep 3 Magpul mags loaded with factory softpoint ammo and handy at all times, with the dustcover on to take pressure off the feedlips. At any given time I usually have 6 or 7 mil-spec mags loaded with FMJ ammo too. As for ammo cans, all I have are military steel cans. My son the Border Patrol Agent gets his hands on the various military cans at work and brings me some from time to time. Free is good! I've never owned a plastic ammo can. Magazine springs, one of the most cussed and discussed things among USPSA shooters. I have 4 STI hi-cap mags that I've been using in competition for over 15 years that still have the original springs and work just fine. These mags don't stay loaded, but are cycled from fully loaded to empty a LOT of times every year. I get a kick out of the shooters who change their springs out at least once every year (some will change them 2 or 3 times a season). You ask them why they say "Because that's what's recommended." When you ask them by who, they tell you by the top competitors. When you point out that those guys are sponsored and probably get the springs for free, and then ask them if they have ever actually had a malfunction attributable to a fatigued spring they get all huffy! <laughs> On the other side of the coin, I've had single stack 1911 mags and G.I. AR-15 mags that have been loaded for years that worked just fine when used.