I snagged a banker's box from work recently (with permission, we got a huge pile of them in for year-end!) and am planning on using that for scenery storage and transport. Most of my 28mm pulp stuff (so far, anyway!) will fit into the one box, it's solidly constructed but not too big to carry easily - I do all my gaming away from home, so that matters.
Similar to jimbibbly's paper boxes, but sturdier!