I'll be heading down to the BVI in 11 days. This is a 2 week sail with 5 guys. Just to give you an idea, size wise, I'm bring a Polar Bear 24 with a frozen salmon on a plank (ready to throw on the grill), 5 steaks, hamburger, 6 large chicken breasts, cold cuts, cheese slices and blocks, and a few other refrigerator cold items, plus room for a few other things. I use 2 frozen packs and everything has always stayed frozen the 12 hours it takes me to get there from the time I pack the cooler.