Good morning: Tomorrow I am traveling from Amarillo, TX to San Diego, CA for the purpose of collecting water samples for a project. Instead of shipping them overnight through USPS I thought it might be more cost-effective to take them with me on my return flight to Amarillo. I have placed water samples in my check-in luggage before. However, in this instance I need keep them cold (near 4 degrees C) in order to ensure that what we observe in the water is the same as when it was collected. I understand that I can use dry ice to keep the samples cool (no more than 5.5 lbs) but I am not 100% sure what type of cooler I need to use. I know I cannot use a polystyrene (aka styrofoam) type cooler but what other options would I have? Can I simply just use a typical plastic cooler used for outdoor recreation? Thanks.
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