I have one of the molded plastic gun cases that Remington used for a while to ship their 1100 in. This case will hold only one barrel. This case is used, but not abused. I will sell the case and ship it to Lower 48 states for $55.00.
The case oldstuff is selling will hold two barrels. Here is a photo of my case with my 1187 trap gun. The barrel closest to the gun is a 28" that I use for sporting clays. It's the longest that fits in that position. The barrel closest to the hinges is a 30" step rib trap barrel. There is 3" to spare in that position, so it will hold a 32" barrel with an extended choke tube.
Note that 870 barrels have shorter tangs, so the case will hold longer 870 barrels. You can visually see that in the pic Smok'n Joe posted.
The case will hold an 870, 1100 or 1187. It will clear a factory monte carlo buttstock.
I PM'd oldstuff with an offer of $45 including shipping. If someone is sitting on the fence now is the time to jump in.
And here it is with a 21" rifle sighted turkey barrel and a 28" field barrel. The case will clear the rifle sights. And note the factory monte carlo stock.