In this task, You are given a review of Amazon's food products. Your task is to divide them into two classes: negative or positive, depending on the content of the review.

Q: I've had my replacement bands for 3 months and one side has already broken. I didn't hit my fit bit on anything and wasn't messing with the band. Pretty upset I have to buy another set of replacements so soon.

A: negative
****
Q: This is the second power bank I bought in past two month. The first one turns out the capacity is too big to travel by air. I got this one under 10000mAh. Tested a couple of times. Works great. Built in cables very convenient. Comes with a storage pouch good for travel.

A: positive
****
Q: This is my first purchase of a backpack. It has more room than I need. In fact, it takes me a few tries to find what I'm looking for. Once you get the hang of it, it's perfect for travel, work and occasional clothes.

A:
positive
****