Ah, I shopped around on this same topic.. A quality bag sure makes life more pleasant at the range, especially during matches.
Settled on the "Todd Jarrett Signature Range Bag" by Green Mountain. Don't believe they have a website. I bought it mail order; they usually advertise in the major gun magazines. Been using it hard for the past year.
Extremely well made. Ballistic nylon; super-tough stitching and attention to construction detail throughout. I especially like the water bottle bag on one end; on the opposite end is a zippered pouch for little loose stuff, plus quick access to stapler, keys and wallet. Long zippered pouch along the front of the bag; has elastic loops for mags and tac light there as well as on the underside of the zippered lid. Also, has rigid dividers in the main compartment which you can reposition to your liking with Velcro. Has a rigid panel sewn into the bottom to prevent sagging when packing ammo. These are the details that make the difference between a quality bag that will last years of hard use being dragged to the range, and one that will fall apart pretty quick.
Lots of room: Holds two full-sized handguns in the front and back gun pockets; these are sealed with Velcro flaps. And you could put a smaller handgun on either end. (I've carried my G19 and 19ll in the former pouches and a S&W .22 revolver and a G26 in those two end spots.) In addition to, in the main divided compartment of the bag: ear muffs; cased shooting glasses; holster, belt, mag pouch, timer, Leatherman, mini cleaning kit, spare parts baggie for range emergencies, mini first-aid kit.
That's the lot of it. And it all fits well in this top-of-the-line bag, and well-organized, too. Saves time searching for items, such as in between stages at a match.
Cost about $125. Well worth it. This is made like a piece of high-quality soft luggage. Green Mountain makes a smaller version with similar features for slightly cheaper. My advice would be to buy a slightly bigger bag than you think you need now. You'll appreciate the "growing room" later when you keep adding more crap for the range...
By the way, I've got my eye on the Dillon "Range Pack." Thinking about it for my long gun gear. Handy to have it on the back trudging to the next stage during those three-gun matches, when I've already got my hands full with a cased rifle and a cased shotgun. Even comes with a water bottle and folding stool.
http://www.dillonprecision.com/
Bagmaster also makes nice stuff, and has a pretty broad product range with lots of sizes of range bags. I've examined their wares at the gunshop and it's well made. Good value. Have one of their spring clip pistol pouches for carrying while backpacking and like it a lot.
www.bagmaster.com
Hope this helps,
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mib61