Zipper pull made from some shoelace I had lying around:

Parts of the bottom of the bag were threadbare (literally starting to let light through). Gooped over everything with a bunch of Shoe Goo sealant, which turned out messy but effective:

Overall I'm pretty please with how this turned out. Maybe not too pretty to look at, but thoroughly functional, and I'm sure it'll extend the life of this bag quite a bit