Long long time ago I was hunting a tool box in an ag supply place, an old guy said to go with a straight top so the whole thing opens up, no way it can leak. It's the only kind I've ever used. Rawson Koenig, I think it is, out of Texas, this is the second one, I had it Rhino Liner sprayed. Alot of metal, real good locks, foiled a break in attempt.