USGI load bearing vest

If you need something to carry mags, water, and IFAK but you don't have much money AND you're based enough you don't care about fashionable camo patterns, this is the deal for you. USGI gear isn't fancy and "milspec" doesn't mean "high quality" but it's cheap and good enough. If you don't have anything else and you need something fast or if you just want something to keep in your trunk, this is the way.

Amazon also has triple mag pouches for $8.99...
https://www.amazon.com/Specialty-Group-Official-Molle-Triple/dp/B00475QK4Y

...and single mag pouches for a buck fiddy.
https://www.amazon.com/MOLLE-II-Official-Military-Camouflage/dp/B0039D374G/