I use a 55 gallon barrel for loose shred like screws, bolts, litte loose metal and anything that doesn't leave air pockets, it's 90% full and weighs around 350-400lbs. When I fill it I will dolly it up into a trailer, and push it into a bin at the yard. It's worth it, but depending on how much you are paying for it. They often store chemicals In them so clean them out, talk to local landscapers also, they sometimes use them to store there fertilizer or when they make there own. Mine was free, I forgot how I got it but good luck