best heat packs to use for shipping

so i have made up my mind to leave the hobby and want to make sure my 2 ritteris and my beautiful blue gig make it safely if i have to ship. what are the best heat packs and where to get them?
 
I use 20 hour Uniheat. I would be very reluctant to ship mags and gigs in the winter and in general. They do not travel well and shipping costs will be high. Always check weather at destination and make buyers pick up at Fedex first thing in the morning. Also, Fedex might refuse the shipment if you are not registered to ship aquatics with them.
 
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