as a former rave dj, like in a warehouse at 4am, i had to haul around records, lots of records. i never knew if i was spinning for an hour, two hours, or 6 hours. and i had no idea what the crowd was going to be into so i needed to make sure i had something to keep the flow rolling.
i would bring 100-150 records with me and hope for the best. the record crate was heavy and would make some normal backpacker's load look UL.
today it's a USB hard drive and a light weight laptop. i miss the days of lugging records ;)