Instruct: Classify an Amazon review into positive or negative sentiment.
Query: Extremely dense

While this product offers an astounding quantity of catnip at an unbeatable price, buyers should be aware that this toy is so incredibly heavy that most cats will be physically unable to play with it. I don't know if my cats are unusually weak or what, but even when they work together they're unable to push the sack more than a few inches at a time. The low sale price is also offset by the cost of shipping such a massive brick of catnip across the country. Cat fanciers would probably be better served by more traditional cat toys, like a nice clothbound copy of The Infinite Jest that their kitties can bat around.