Roomy Capacity:32*21*40cm / 12.5*8.5*15.75 in. The capacity of the Yarn Storage Organizer is 25 liters can store 30 pcs yarns of 50g.The crochet/knitting backpack bag is great for larger projects that require numerous balls of wool, which loaded with spacious main compartment for unfinished projects and individual 6 interior pockets with matching holes on the side to prevent skeins of yarn from tangling. Holes are stiff enough so yarn won't pull out and pets can't get in! USB Port Design: With built in USB charger outside and built in charging cable inside,this usb backpack offers you a more convenient way to charge your phone while walking.