So I have had one of these (blue on the left) and love it. I keep it in my cooler loaded>stick it in my pack and when shooting hang it from my tripod-very handy. Designed really for three it will carry 6 holders doubled up-two in each pocket.
I've been looking for another and found what I thought was a couple more at Igor's. But they are a version I have never seen before. Designed for 8 holders they will actually hold 16 doubled up in the pocket. Anyone ever seen these big ones before??
they stack up to look like this:
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