I have a Dillon range bag. I don't shoot IDPA, only at the local indoor range. When I go to the range, I usually take 3 - 4 pistols and about 200-300 rounds for each one. Holds everything I need. There are 2 full size zippered pouches , 1 on each side of the main compartment. In 1 of the pouches, there are 2 pockets that I can hold 8 - 10 G17 mags. In the main compartment, there are 3 pouches with a velcro flap. I used to carry all my range 'stuff' in a gym bag. Man, don't know why I didn't buy a Dillon bag years ago. Hope this helps.
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Gun control means hitting your target!!!