What i use for long trips is a cool bag, i tend to eat alot of takeaways so i have stacks of the plastic food containers.
Put your worms etc in the containers and put them into the bag.
If you have frozen bait that you are taking, wrapp them in lots of newspaper and only unwrapp them when you are about to use them the frozen bait is always kept at the bottom of the bag. they will keep frozen for a long period of time as long as you don't unwrap them
I usually take an extra newspaper just incase.
Take plenty of ice blocks, wrapp some in more news paper, when the unwrapped ones have defrosted, unwrap some more.