Dynamic Discs says this about their Cadet Backpack:
The Dynamic Discs Cadet Backpack disc golf bag features a maximum amount of storage with a minimum footprint. The Cadet Backpack leaves nothing to be desired as far as storage features are concerned. Boasting an ability to hold 17+ discs in the main compartment, coupled with two additional zippered pockets for accessory and valuables storage the Cadet Backpack is the perfect lightweight and compact solution to your most demanding disc golf needs. The Cadet Backpack also features two convenient mesh side pockets that will hold anything from a water bottle to more discs.
Large main disc compartment that holds 17+ discs
Compact footprint with adjustable straps for a comfortable carry
Two zippered compartments large enough to hold an apparel item, disc golf accessories, and valuables
Two mesh side-pockets for additional disc capacity or multi-use storage options
Two 'D-ring' attachments that are perfect for carrying towels or any other accessory