I have found that Disposable Diapers, Wet Ones, baby powder, and Bed Chucks, are a good source for barter, providing you meet up with those who need them.

I think your barter items might very well be "confiscated for the greater good" if you are in a shelter situation and the folks running the shelter learn that you have them.

There are many items that you may not need but would be great to have as barter material. Unfortunately, the more that you have, the more space and money it requires, the more protection you are required to provide.

Good Luck on finding the optimal middle ground!