Well, I got paid for the bags. My supplies, plus $10 an hour for my time (and he rounded 3 h 35 m up to four hours even). So it seems like a fair deal for me.

And he was happy with the bags, and said he could start using them right away.

And - I just found out my Tuesday afternoon classes (two sections of the same lab) are cancelled; it's "Easter Break" for the class. Yay! That means I'm done at 12:15 tomorrow afternoon.