I picked up an MTM Case Gard 50 cal. hard plastic case (PN: AC-5-C-)to put my AB in. It holds the Iwata Eclipse BCS in the original box, a quart of cleaner, several 1 and 2 oz bottles, along with the Iwata hose, a HF regulator with guage and one of the red HF water trap cartridges. Will keep it out of harms way, and everything in one place. Double latch, lockable, and there is still a little room for more bottles. Runs under $10 bucks at most sporting goods outlets.
Metal containers are also available.
I visited the local Goodwill store and bought a couple of small , used steel gift boxes for either 50 cents or 99 cents each.
Some Goodwill stores even have plastic models donated by folks, though variety is understandably unpredictable. Some were old ESCI 1/35 diorama accessories; most are half assembled car kits.
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I will admit I actually bought a small plastic case from Wal Mart prior to buying the metal boxes.
Ya oughta see some of the stuff being sold in those Goodwill stores.
Even Tesla car owners are visiting the stores in search of treasures.[:O]
I have two of the MTM cases, for which I paid like $12 on eBay. I store all my ABs in there. I cannot imagine a better case for ABs.