Depending on what your definition of "decent" and "light" is, I have a pack you could borrow. Actually, I have two, one is medium sized and one could carry Sasquatch without bending his legs. Both are older, non-camo, backpacking style internal frames. The smaller one is turquoise and the larger is purple (don't judge, clearance sales are a beautiful thing).
Many on this board have helped me and I'll pass it on if I can. I'm in Arlington and the only thing I would ask is that you return it clean.