Paddle strop cases

I recently bought an extra-wide TI double sided strop. When it arrived, there was no "case" for it, like there is with the other paddle strops I have looked at. I was wondering if anyone knows where I can get a case for it, or maybe just some nice travel tips about travelling with it rolled up in something that won't ruin the strop or whatever it happens to be rolled in. Keeping in mind that one side is pasted.

I made bristol board slip cases for my paddles, but if it's unpasted you can just wrap it in a shaving towel.

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What is this bristol board and where can I get some?