My range bag is a black carry on type luggage bag. It has a large main compartment, and a small pocket it measures 12"L x 11"W x 10"H.
It cost me 50 cents at a yard sale but is like new. I figure it is all I will need for the foreseeable future.
It carries my Ammunition, Rear bag, Ear protection, FAT Wrench, Tools, Tacks, Magazines, Pens, and a few other odds & ends.
I carry my bag and a locked hard case containing 1 trigger locked pistol, and one trigger locked rifle. The next week I swap out the rifle and pistol for another. If I have a guest I bring 2 cases 2 pistols & 2 rifles, extra ammo and the bag.