I have an Americase Two Gun Safari case. My dad had one of their original two gun safaris from way back when and it was solid for almost 30+ years, I had to replace the foam in his and I gifted it to my hunting partner when I bought my new two gun. It doesnt get much better for cases. Love having another rifle along or extra room for storage in the second rifle bay.
Check out their single rifle cases if you have a large long range firearm. I dont trust plastic cases when am traveling long distances via airplanes. I know quite a few guys swear by the pelicans, but I prefer the 0.08 Aluminum of my double gun case. I am considering purchasing a single rifle case from them as well.