If you go to either a Target, Walmart, Costco etc. you can find a general purpose nylon/canvas bag for under $20 bucks that will serve just as well as most of the expensive "Range specific" types, and they are not a whole lot different either. The ones from Dillon, Midway, and other shooting supply Companies are fine, but you will pay the price for a "GUN BAG".
My son bought me a generic Range bag at Target about 10 years ago for Fathers Day, and it is still going strong. It has lots of pockets, compartments and has a stiff thick liner on he bottom that makes it very adept at carrying quite a bit of weight without bending or deforming. The added plus here is that when we go into a Restaurant before or after a Range session, I take my bag of guns in with me (NEVER leave them in the car) and it does NOT look like a gun bag - I don't like to advertise that I am carrying a bag full of guns!
Chief38