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: Funs 40L Water-resistant Outdoor Camping Hiking Rucksack Travel Daypack School Backpack (Blue)
Product description: Funs 40L Water-resistant Outdoor Camping Hiking Rucksack Travel Daypack School Backpack
Product feature: Capacity of 40L, Material: Terylene, Nylon; Water-resistant, Stain-resistant, Padded and breathable mesh back panel and shoulder straps offer cushioning comfort, while also promoting air circulation along your back and shoulders, Multiple attachment for tools, trekking poles, camping gears, sleeping bags, tents, etc., Perfect for outdoor activities like hiking, climbing, camping, running, jogging, walking, cycling, fishing, travel, vacation, beach wear, can be also used as a student bag
Product brand: FUNS
Target attributes: Capacity
Answer: attribute: capacity
value: 40l
source: product feature
attribute: capacity
value: 40l
source: product title
attribute: capacity
value: 40l
source: product description