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Title: A Must Have
Review: I do travel lots and initially had questionable comments from TSA regarding the gel pack. NOW with time it has been no problem and no hesitation on passing the security checkpoint ... even in the S.E. Asian countries.The gel will greatly expand if left in the water too long but after a few trials and error one will know the "soaking" limits. This is a must buy for people who travels with a need to keep their pen medication at a cooler temperature.
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