Toolbox replacement time. Suggestions?

There was a small dip in the center of the floor where a drain is. Long story short I totaled out both the top and bottom box when all the draws came flying out and

they crashed to the floor.
If you open most of the draws on a tall box it will tip over. Ask me how I know. When I was a young gun this happened but I was lucky enough to see it going and pushed it back in time. If I had my back turned it could of killed me.