i keep a plastic grocery bag tucked under my seat to cover my nice brooks saddle in the rain and snow.

other than that, i just make sure everything is lube'd, when it gets home i wipe off all the water/ice/snow and it goes back to the dinning room

^^^
thats the great thing about being single and a college student, at worst i can tell the roomates 'tough crap' , it's not like i'll be sleeping in the dog house