I saw a guy use a mini-loaf pan for a PSK container; about 5.75 in. x 3 in. x 2.1 in. You can get them in 3-packs at the Big Blue Retailer for around 8 dollars. I bought a pack to see how it worked out. Still building and packing.

Standard Disclaimers
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"Its not a matter of being ready as it is being prepared" -- B. E. J. Taylor