I just transferred my collection of (mostly) 9 pin minis to a plastic tackle box. You can fit 4 6922s or 12AX7s in each small compartment and I put the few EL34s and 6v6s into the larger slots, then there is the whole bottom for bigger things. Course, on ebay you occassionally see the TV repair tube carriers for sale, sometimes even full of tubes. But right now I don't have nearly that many that I would need something that big.