Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Mountainsmith Spectrum
Product description: Newly designed with ease of access in mind, our Spectrum camera specific day bag features organization for everyday essentials including your laptop or tablet. Built for the ruggedness of your world travel and comfort for hiking all trails urban and mountainous.
Product feature: 43 centimeters high, 29 centimeters wide, Cover flap access to main compartment, Side panel access to lower camera compartment (Fits one DSLR and accessories), Side access back panel laptop compartment (Fits most 17.0" screens), Mesh side pocket, Air mesh back panel, Product Dimensions: 17 x 6 x 11.5 inches, Shipping Weight: 3.22 pounds, ASIN: B00IEOEV0E, Item model number: 14-81220-65, Date first listed on Amazon: February 13, 2014, Domestic Shipping: Item can be shipped within U.S., International Shipping: This item is not eligible for international shipping. Learn More, Average Customer Review: 4.2 out of 5 stars 11 customer reviews
Product brand: Mountainsmith
Target attributes: Material
Answer: attribute: material
value: None
source: None