How about a bandolier type setup? Don't think I've ever seen such an item, but it would give you a lot more area for lure storage.
I do a lot of pond fishing and like to have my tackle somewhat mobile. I have a backpack that holds 4-5 3700 series storage containers, but even that is too big to lug around all day, so I also take along a zippered belt pouch that is made for carrying shotgun shells. I'll move the lures I think I'll use that day into a couple of smaller storage boxes and throw a few bags of plastics in there as well, and leave the backpack in the truck.