When I first started playing with my own gear, I used a laptop bag for a couple markers along with a small duffel.
More recently I had a few more and picked up a cheap rifle case.
Currently all my markers reside in a extended and thick tool box divided by pieces of foam. Everything else is in a volleyball duffel. The ball section holds two masks pretty well!
As long as I can do my load out carrying my gear in two hands, I'm alright.