Well, I just restocked some of the things I use up the most and that includes:
Big fat rolls of packaging tape
Legal pad of paper
One thing I carry with me always are two file folders. One contains handouts of local charities that take donations and includes info on who picks up, what kinds of items and contact numbers.
The other folder contains stacks of signs printed on regular printer paper complete with my logo. They say DONATE, GARAGE SALE, TRASH, TAKE TO NEW HOME and another that says "Notes about Today's Project." I use the last to write homework to-do lists or shopping lists for clients that I can leave with them- or it might have reminders such as "Remember to call the charity truck. Remember to call the computer guy," and so forth.