Instruction: Parse the product information to locate the target attribute, and then provide the extracted value of the target attribute and its source in the output, specifying None if the attribute is not present.

Input:
Product title: Kamabags Girl's & Boy's Lightweight Backpack Large Capacity Bookbag
Product description: Item: Kamabags Girl's & Boy's Lightweight Backpack Large Capacity Bookbag Package: 1 x Children Book Bag Mutiple colors for you to choose Waterproof function on the surface Comfortable adjustable shoulder straps
Product feature: NEW DESIGN: Lightweight Children Book Bag Backpack Kids School Shoulder Bag Backpack, Smart design of the large capacity, 2 mesh water bottle pockets on sides., Dimensions: 18.1" x 14.5'' x 5.5'', Weigh: 1.14lbs, cushioned shoulder straps with soft breathable mesh for extra comfort and stabiliy, Product Dimensions: 20 x 14 x 0.9 inches, Shipping Weight: 1.85 pounds ( View shipping rates and policies ), ASIN: B01FE6J7KI, Date first listed on Amazon: May 9, 2016, Average Customer Review: 3.0 out of 5 stars 1 customer review
Product price: $26.99
Product brand: Kamabags
Target attributes: Capacity
Answer: attribute: capacity
value: None
source: None