Instruction: Using the product's title, description, features, price, and brand, identify and retrieve the values associated with a specified set of target attributes. Output the extracted values along with their respective sources (e.g., title or feature) indicating where each value was found.

Input:
Product title: Mil-Tec Rucksack 35L Flecktar Camo
Product description: Rugged workhorse to roll! Take along the vital supplies with this top carrier. - Nylon construction - Water-repellent lid and lining - Padded back panel with air channels - Drawstring cuff on main area - 2 side pockets - Mesh stuff pocket in back for maps - Dual cinch belts secure load - Top lashing hardware - 11 x 18 x 7" w., 1 1/2 lbs.
Product feature: Nylon construction, Water-repellent lid and lining, Padded back panel with air channels, Drawstring cuff on main area, 2 side pockets
Product price: $19.95
Product brand: Miltec
Target attributes: Material
Answer: attribute: material
value: nylon
source: product description
attribute: material
value: nylon
source: product feature