Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: Is this the medium or large backpack?
Document: I head to the pool 3-5 days a week and this bag has been nothing but amazing! The size is perfect for me to fit a showering kit, several swimming suits and a large beach-size towel, not to mention enough pockets for almost every small item to have its own spot! I would recommend this bag to any swimmer is looking for the convenience of a backpack! (I have used many shoulder sling duffels and wish I had discovered the convenience of a backpack sooner!
Answer: yes