Backpack for gym

For the last two years, I’ve been carrying a gymshark x-series .03 backpack that I like - it zips in a U shape from the top, so I have access to the whole body of the bag, rather than everything falling to the bottom. It also has some customizable compartments that hold things into place. Problem is that the coating started to flake off recently. I don’t carry very much stuff, shirt, shorts, shoes, and a small bathroom kit. the gymshark is 20L volume. OI’d like to keep it under $100. Anyone have any suggestions? Thanks in advance!