Dang it!
Keep them warm while fishing. I made a huge mistake and brought all of my maggots with me on my last trip. Even though they were in my pocket, they still froze solid and died. Usually, I only bring what I need. Dumb...what the heck was I thinkin'?
Waxies in a cool place, pick out dead ones, as said correctly above. Maggots and mousies must be refridgerated because if you don't they will pupate and hatch into flies, invade your entire house when you open them to check on them, and nearly cost you a divorce or worse (you're out of bait)!!!