I have heard that some folks have been keeping bait in them. I think that may not be a great idea, especially if you don't get it all out when you are done.
I have just signed up to this site this weekend and actually signed up for the LA - San Diego chapter club. I must say that this site has the most to offer out of the many I visted I have a Black AV DOB 5/01/01 it been to the SEMA Show and will be in an upcoming edition of Truckin SUV.
I've used my boxes as coolers many of times at tail gate parties, Beach and camping and works well especially at night do to the cargo lights
I carry drinks on the left, um, "stuff" on the right. Worked out well last night when I had to bandage up the five-year-old at the park. Set her on the tailgate, whipped out the bottled water from the left side, first aid kit from the right. Get her to stop bleeding and taped up before she is allowed back inside!