My husband did this while he was in school - it was hard work, but the pay was pretty dang good for part-time, and as you note, no weekends, yay! And at the time - this was quite a few year back, now - there were even some benefits, though I expect that's changed now.
From what I understand, the packages aren't heavy. There are just lots of them. I'm not sure how much "getting into the swing of things" was allowed since he was (and is) a pretty strong guy. But I'll try to remember to ask him, just in case nobody with more current experience happens to come along.