Tactical gun cases are available all configurations.  Blackhawk, Bulldog, Allen, Uncle Mike’s,  Pelican, Tac-Force are among the most popular options.

Cases come in several sizes: Bulldog Cases Magnum Tactical Rifle Black Soft 46″. Medium case is 33″x10″ (838 x 254 mm) inside; large case is 41″ x 10″ (1041 x 254 mm) inside.
Medium case has three magazine pouches with hook-and-loop closures
Large case has five magazine pouches with hook-and-loop closure.