Instruction: Given the title, description, feature, price, and brand of a product and a set of target attributes, extract the value of each target attribute from the product information. Output the extracted value and the corresponding source (e.g., title or feature) denoting where the value is extracted.

Input:
Product title: ENVOY Classic Backpack Medium Size
Product description: This is a basic practical school student backpack, with fashion multi-color choose. The shoulder straps are adjustable, very comfortable and practical. When you travel or sport or go to school, you can choose one. It is very suitable and functional. Brand: Envoy Model: E8025 Style: Solid color Material: 900 Denier Polyester. YKK Zipper. Duraflex Buckle Lining: Water repellent polyester Weight: 0.57KG Dimension: (W) 13 x (H) 17.7 x (D) 7.5 = (W) 33cm x (H) 45cm x (D) 19cm Structure: Main Pocket. Front Pocket. Side Pocket. Cellphone Pocket. Headphone Hole On Shoulder. Laptop Pocket Capacity: 28L. Can load a 14 laptop, umbrella, document and so on Design: Use Top YKK zipper and Duraflex buckle, flexible and durable. Breathable mesh back , High foams shoulder straps and ladder lock are adjustable, humanized, very convenient and practical. " Respect for the customer, all for the sake of customers, " this is our service concept.
Product feature: 100% polyester water repellent, Polyester water repellent lining, Polyester Fabric. Water Repellent, YKK Zipper. Duraflex Buckle, High Foams Shoulder Straps. Zip Closure, Capacity(Volume): 28L Dimension: (W) 13 x (H) 17.7 x (D) 7.5 = (W) 33cm x (H) 45cm x (D) 19cm, External- One Zipper Pocket, Two Side Pockets(Load an Umbrella and a Water Bottle), One Headphone Hole On Shoulder. Interior- One Zipper Pocket, Two Multi-function Pockets, One Laptop Pocket, Product Dimensions: 18 x 1.2 x 15.6 inches, Shipping Weight: 1.4 pounds, ASIN: B00KELDXWM, Item model number: E8025, Date first listed on Amazon: May 18, 2014, Average Customer Review: 5.0 out of 5 stars 3 customer reviews
Product brand: Envoy
Target attributes: Type
Answer: attribute: type
value: student
source: product description
attribute: type
value: to school
source: product description