Using styrofoam coolers is an easy alternative to either of these two options. (pethelpful.com)
They do provide a small styrofoam cooler for drinks and bags for taking to the store, as well as shampoo, conditioner, lotion and hand soap in the bathrooms — they smell nice and there was plenty for our 11 day visit. (parrishkauai.com)
Large Styrofoam coolers make great community cat shelters. (utah.bestfriends.org)