I have a coleman xtreme 28l that i got for a 24hr ultra i used to do once a year where you setup a tent for your "home base" at the start/finish line between laps. I'd camp friday afternoon to sunday midday and if i put my perishable food in it with a couple of bags worth of "party" ice from the shop (no freezer) on the friday morning before I left there was still a surprising amount of ice in it on the sunday, enough for me to still have a cold drink after I packed up.
I have a coleman xtreme 28l that i got for a 24hr ultra i used to do once a year where you setup a tent for your "home base" at the start/finish line between laps. I'd camp friday afternoon to sunday midday and if i put my perishable food in it with a couple of bags worth of "party" ice from the shop (no freezer) on the friday morning before I left there was still a surprising amount of ice in it on the sunday, enough for me to still have a cold drink after I packed up.