Instruct: Classify the given Amazon review into positive or negative sentiment.
Query: Great idea - but not functional

I loved the idea of thee bags, and purchased them for a trip. Too bad they didn't work. I would put only a small item in the bags, and they always poped open, despite the "zipper." Wast of money, waste of time. I'm too lazy to return them, so I just put them in recycling.