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.
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Question: 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.

Answer: positive

Question: ...unless you want little wads of yarn roving floating in your fish tank or terrarium. I received a little cup of small, damp, grayish-green balls, but being new to marimos I didn't really know what to look for. Over the course of a week or so in the tank they slowly became more pale and gray as if the color was fading out of it like a dye, and I did a bit of research and realized I'd been swindled. I dissected one and I'm fairly certain it wasn't even any sort of living plant matter, it seriously just looked like a balled up piece of synthetic fibers. They went in the trash and I found some actual lush, green marimos.

Answer: negative

Question: Very nasty. Not recommended. Mistakenly/blindly bought two boxes of this, used up one box over a couple of months, cat didn't much care for it, I didn't much care for it either, and now we have switched to Fresh Step brand instead (or he has, anyway; I still use the toilet), will not buy Arm & Hammer again, and have a leftover unused box of it to dispose of. In fact, now that I think about it, I believe I will not buy any Arm & Hammer product ever again, just because of this experience.

Answer:
negative