I found the ffsystem.co.uk PLB container on a different board, but thought that the folks here might appreciate the info as well. It's as an interesting option for those looking for a burly middle-to-higher end option: they're hand machined from solid delrin rod with two stainless latches and two o-rings (one axial seal, one radial seal). Construction-wise it seems pretty similar to the Light Monkey canisters I've seen, and I have no doubt they'll exceed most recreational ranges without a leak. At 100GBP (~$130) each, they seem like a great value.
Note though, that these things are big. At 175mm tall and 83mm diameter (6.9" x 3.3") and 900g (~2lbs), they're more comparable to the McMurdo fast find canister than the HDVSeatek or Custom Divers options. If you've got a 20oz insulated tumbler, they're almost the exact same size. It isn't a tiny little thing you can throw anywhere - it's a planned piece of kit. I thought I'd stuff it into a pocket with my DSMB and spool, but they just barely all fit together into a DGX Horizontal pocket, and are hard to remove once in. This will live on a belt for me, but my dive buddy will likely require convincing to wear hers .
Usable interior dimensions are 122mm deep and 62mm across (4.8" x 2.44"). It fits my PLB1 with the float case on it easily, with room for candy bars, water, keys, cash, and more. Somewhat surprisingly, they're also just about neutral in freshwater - <50g floaty.
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I was checking out this option (I really like the latches vs the screw cap, small hands....) and they will make custom sizes. Just FYI.