I have two older day packs to give away. Both are quite used but not really useable in their present form. Tears, frays, etc. The shoulder straps seem to be OK though. I suppose the zippers could be salvaged also. One pack could probably be repaired by someone with a heavy duty sewing machine and some skill. I have neither.
These were never high end lightweight packs, but might serve someone's needs for a cheap bang around pack or spare parts.
PM your address and I will even pay the postage.