I hope no one feels bad about what they send! Each person is different, and weight of a box could be because someone sent some old magazines or books they didn't need anymore. Or maybe their person likes a heavy candy. Size could be because they needed to fit something solid (like a book), or they have a fluffy item.
The $20 limit can also be met so many ways-- making items yourself, finding something on sale/clearance. If my person wants scraps, I'm not going to put those scraps in the $20.
Hopefully we all love what we receive! If my person ends up with something she can't use, I hope she knows someone who would appreciate it and she can give it to them.