I really enjoy having this on my backpack cart. Fits much better than any of the backpacks that I have put in it. Which makes sense, this was designed specifically for the backpack cart.

The cart can hold 20+ discs in the main compartment. That for me holds all that I need disc wise. The top compartment is pretty nice. You could shove more discs into that if you wanted. It has a stiff insert to give the pocket a stable ground. This is large enough to hold a jacket and some extra things. I have my towels in that pouch, a long with other items that can get wet and not get damaged (for when the towels get wet). I can even put my magic 8 ball game in it just fine! The side pouches are pretty convenient as well. With these I have my reusable scorecards, minis, and the card games. There is even a "hidden" pocket right about the top compartment. I find this useful for my wallet and phone. 

Overall the bag holds basically everything that I need for casual rounds, random fun rounds, and the tournament rounds. Solid bag for the backpack cart.