if you're going to go plastic, invest in one of the t-stak/stacking systems of the big brands. they're well made, and the bases have wheels on them (very important when it gets rainy/humid). My most frequently used tools are in a metal toolbox much like a Kennedy box, except it's from 70 or 80 years ago. The bulky/rarely used tools go into two milk crates, and all liquid consumables go into another milk crate.