CRAFTSMAN TRADESTACK 22.5 Inch Rolling Tool Box - Waterproof, Stackable Storage System with Wheels for Indoor & Outdoor Use - Perfect for Garage, Workshop, Job Site and Mobile Mechanics (CMST21445)

This is Craftsman's cheaper alternative to the Milwaukee Pack-Out System. I wanted a rolling tool box that I could lock.The first thing of note is that the clips on the sides of the handles break easily. I broke one on my car seat setting it in my car. I don't even know what the clip is for, but there it is.I was especially glad that it worked with my TradeStack bag. ( I think that's the name of the product line before Versa stack ). My bag clips onto the top and doesn't fall off when walking. I really like the quality of the release system.Two draw backs to this box.One is that, as it is plastic, the middle has a tendency to bulge or warp temporarily depending on what is inside it. This will cause the tray to not fit in the top and become loose. Any small items you want to keep separate, put them in a bag or small plastic box and toss the tray of you are wheeling around a lot of stuff.Secondly, and this shouldn't need to be said but it does, all this box does is keep honest people honest. I chain mine to something to keep someone from rolling it away. The hole for the lock is only big enough for a luggage lock. And the lock doesn't need to be broken. A good swing of a hammer would bust the locking area off.So if you are looking for ease of tool movement for a decent price, and you don't want someone grabbing your tools in the heat of the moment, this box will serve you well.If you are trying to secure your tools and have to worry about theft, go with a metal box.