Buying used snap-on box Vrs new bigger china box

I've been working out of a 40" Craftsman roller bearing slide bottom box, no top box, for the last 17 years.

I'm a bit shy on space for pneumatic tools, although I don't have very many, I store them and my other blow molded kits on shelving.

If I ever decide to get another box, I will probably buy another bottom box, as opposed to a top box or top/bottom box set to replace mine, because I prefer having the work space. It is really nice having all of your tools right in front of you, beneath your work bench.

Mechanical tools aren't a big deal for me. I have a complete set of everything up to 36mm and 1 5/16", but I don't have redundancies, like multiple pairs of pliers that do the same thing. Every tool that I own has a unique purpose and that saves me a lot of room and frustration.

If I were a mechanic for a living, I'd probably have a set of long and short wrenches, because I'd be replacing parts on vehicles that were buried in tight quarters, but I've never run into that problem with the work that I do, so I don't have the need for redundant sets, but they have their place.

I will say, that I've puzzled my tool sets into my drawers set up with the depths used within 1/4" in some places. I'm going to need another box if I start getting into wood working soon.