I would say some bottled water (everyone can use water) and some 40 hour shipping heat packs in case you need them. Also maybe a pillowcase because it folds up small but if needed could temporarily hold your snake or gecko while you clean their tubs. If you don't have one already, a digital temp gun could be very useful for everything from is my car too hot/cold to is my portable uth dialed in right on this thermostat? Bowls, hides and substrates are easy to substitute so really just a regulated heat source and a safe, escape-proof tubs top the list for me.
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