With a recent purchase of our Emisar D4SV2s complete with the shorty tubes for 26350 batteries, and the lack of decent options for storing and transporting 26350 batteries, I decided it was time to build it myself! I started with a couple of cases that were Pelican-esque. The Pelican cases available in this size, the 1010 or 1020 series, had integrated silicon/rubber inserts which were also the seal for the case, but didn't leave enough space for foam and batteries. They were removable, but I would have lost the seal in the process, and didn't want to cut it up, as it would have been difficult to look good. So I bought these ones instead, which were admittedly a bit larger than I would have liked, but were going to be easier to get foam into. I then bought some 1/2 inch solid foam, 1/2 inch "Pick-n-pull" foam, and 3/4 solid for the base layer. I messed around with the cutouts a little to find what I was happy with, and these were some of the options that I liked!
Still to do: I want to get some spray adhesive to glue the block layer to the base layer.
Cons: The case itself ended up being a decent size after I played around with layout, but the lid had a weird rubber insert thing as an extra storage spot. It was easy enough to remove, but it left its mounting posts in place, which I'm not fond of.
As a concept I'm happy with it, but I would like to look at more case options moving forward to see what might fit this a bit better, without the weird posts in the top of the lid that I had to work around. The cases weren't super cheap, coming in around $20, and the foam, which was a ton more than I needed, came out to around $30 shipped. I'm in these cases overall for around $25 each, based on the amount of foam that I used.
Let me know what you think!