You need something for sure. We're not 20 anymore. Tom and I use the 12 qt cool suit setup which is good for 1 hour or so with 4 lbs of ice. The system is amazing! Easy setup but a bit pricey. Tom installed an on/off switch off a 12v battery source and grounded the other lead. He placed the switch right in the center of the dash of the civic within easy reach of the driver. Last week, I purchased the undertray, which cleaned up the look a bit, as well as the drainage accessories.

PS. the hoses that come with the cool suit shirt system/cooler are pretty long so, running the cooler from the trunk should be possible.