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I was looking for something to protect loaded syringes in the refrigerator and found travel toothbrush tubes. They were in a package of two tubes and cost about a buck. Look in the travel size product section at most stores.

Good tip! I wonder about a cooling solution in combination so that you have an on-the-go on-demand injection solution

I needed something to help me cart some trimix on a cruise last year. Looked on Amazon and found little zip up case that was blue that had two freezer packs inside that were removable. It was perfect. I carried the little zip up pack loaded with Trimix inside my backpack until boarded the cruise ship. I knew it had to be refrigerated constantly or ruin this expensive stuff. Was able to do the same thing on the return trip home. It’s perfect answer to your problem.