Here is the perfect container for crawlers:
This 6 can cooler is a soft side cooler with a hard plastic box in the bottom of the cooler. The insides of the cooler are vinyl and easy to clean.
There is a top section with a separate zipper opening. If you get the freeze packs that fit, you can get a couple and keep them in the freezer. Each morning, put a freshly frozen freeze pack in the top section of the cooler. Put bedding and as many crawlers as you are going to use for the day.
If you don't have a freeze pack, just take a zip lock bag and put ice in it and put the ice filled bag into the top compartment of the cooler.
The zip lock bag keeps the melting ice from getting water everywhere in the cooler.
While you are at it, pick up an extra one for your lunch. You can put in 6 cans, and have room in the top for a sandwich or two, or ice.
When you are done with the cooler for crawlers, remove the insert, wash the insert and inside of the cooler and you have a nice personal cooler for use in the boat or when traveling or just want to bring something with you.
I have several of these personal sized coolers that I use when traveling to hold cameras, cell phone, small tools etc. Very nice and convenient.