I have an extra large ABS case with 4 padlocks and gas relief valves made by Boyt (same as Pelican). It's also waterproof and floats. I place my guns in soft cases then pack and lock them into the Boyt case. The ball bearing wheels are a big help. I also have heavy foam inserts cut out to fit all of my guns in case I don't use a soft case inside the Boyt travel vault.

No problems so far!