When you're taking a training class, there's a lot of gear to keep straight. Extra magazines, spare parts for your firearm, boots, gloves, padding, etc. all need to be considered as essential gear to make the most of a training session, whether it's a single day or an entire week. Comfort is key: it's much harder to learn if your attention is diverted to an errant bit of kit.
Blue Force Gear makes sturdy, durable gear that can help keep things sorted when your attention needs to be focused. Items like the Low Rise M4 Belt pouch for AR-15-style magazines add extremely little bulk and weight, yet hold magazines securely and releases without hitch. Weighing less than 1.5 ounces, this mag carrier doesn't add significant heft to your gear, and the hook-and-loop attachment means you don't even have to take your gear belt off to add or remove a pouch.
MSRP: $25, available in black, Coyote Brown, OD Green, Wolf and Digicam.