Fantastic bag for the price, I just found it more difficult to insert or remove discs from the primary compartment than with other disc backpacks.The bottom lip of the primary pocket is 7.5". I found it more inconvenient, slow, and required more force to insert or remove discs from the primary pocket; especially compared to other brands like MVP's or Innova's backpack. This is really my biggest and only complaint.I found that the main pocket holds 17 discs, and the middle 13 of them are easiest to remove. The furthest to the side 2 discs on either side can be more difficult to remove. I found putting some padding on either side and carrying 13 discs most comfortable and easiest to use. Pulling out the furthest to the side discs felt a little bit like a hassle sometimes.The top compartment holds 6 discs, the side compartment holds 1 disc, and the front pocket holds 1 disc. It might not be the smoothest to quickly exchange discs, but this bag could easily hold 17 + 6 + 1 + 1 = 25 discs if you needed it to.The bag is 18" tall, 12" wide (without water bottle), and 16" wide with 40 oz bottle. Window for bottom compartment is 6" tall, with the bottom lip being 7.5" tall.Cons:• Window to insert and remove discs is smaller than other backpacks, difficult-er to remove or add them• Pushing a disc in or pulling it out (temporarily) deforms the bag a bit and can be harder if the bag is stuffed• Mesh pocket came a little damaged; fraying a little with a small hole• Bag felt a little bulky when fully filled, bag looks a little bigger than it needs to bePros:• Great amount of pockets• Water bottle holder can easily hold 40 oz bottle• Convenient phone-sized pocket• Large carrying capacity• Very cheap considering the carrying capacity• Stands upright with no discs in it• Smooth zippers• Durable• Top handle more comfortable than other brands (like MVP's)