If you use Sabol's Army Transport sized foam trays, Michaels has had a rolling storage case that fits the trays perfectly. The case is the Celeste model, but they are discontinuing it. It's no longer on their website & a store clerk said the one I was able to get my hands on scanned as being discontinued. It is similar to their Kimberly case that they are continuing to carry (the Kimberly case a bit too big in both directions to hold the trays snugly).
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In addition, Michaels is currently having a sale 40% on craft storage items. So the Celeste case was $42 USD instead of the normal $70 USD (about $10 USD less than retail for the Army Transport). The 1st Celeste case I found had no tag on it, & since there was no price tag on the shelf for it any more, the manager was going to charge me the Kimberly case's price. So make sure they're charging the correct price.
The Celeste case will hold about 1-1.5" more in trays than the standard Army Transport bag & it's about 2" inches wider. So I was able to slide one of the plastic compartmentalized containers on its end, down the side of the trays (perfect for game chits or tokens).
The lid of the bag has 2 flaps that fold over the top of each other & Velcro closed, with a sturdy handle on the top. The flaps extend out past the edges of the bag, so if something is set on top of them, they won't immediately collapse down into the bag.
With the hard bottom of the case for the wheels & the handle running up one side, the bag ends up being much sturdier than the Army Transport bag. & amazingly the handle is tall enough that even at 6'3" tall, it still rolls easily for me, & I don't have to lean over.
So get them while you can.
