Definition: In this task, you're given reviews from Amazon's products. Your task is to generate the Summary of the review.
Input: The insulation of the bottle is very good, but what is annoying is the system for opening up the straw. There is a little plastic part that you need to use to pull out the straw. That thing broke within two weeks and now it is extremely hard to open the straw

The insulation of the bottle is very good, but what is annoying is the system for ...