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.

[EX 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.
[EX A]: positive

[EX Q]: I am so excited to get this sweat vest! Fits great zips up easily. Fits and stays a lot better then a normal sweat band or waist trimmer. The smell of the material goes away as soon as you soak it in water with soap. But all and all great product.
[EX A]: positive

[EX Q]: This is the most unique diffuser I have ever seen. The colors are very brilliant and overall it is calming and energizing at the same time. The diffuser is very easy to operate and has an impressive output. The larger glass pieces have a mirror effect which makes the diffuser beautiful even when it is turned off.
[EX A]:
positive