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: Sherpani Flora Major Yoga Messenger Bag (Black)
Product description: The Flora Major Messanger bag offers a roomy main pocket large enough for gym clothes, shoes, toiletries and all the other extras you tote around town. It even has a wet pocket for your swimsuit or sweaty hot yoga clothes. Organize the rest of your stuff with a key fob, adjustable yoga mat straps to fit any size mat, cell phone pocket and external water bottle pockets. The removable waist strap keeps your larger load from shifting when you're commuting by bike.
Product feature: Exterior water bottle pockets, Wet pocket for swimsuit or gym clothes, Swivel shoulder strap, Large opening for easy access, 17" x 11.5" x 8.5"
Product brand: Sherpani
Target attributes: Material
Answer: attribute: material
value: None
source: None