Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Cheap oversized knockoffs that leak

As sold by CS Imports, these are not vacu vin wine savers, not even close. It looks like this seller found a very cheap manufacturer to produce something resembling vacu vin wine savers in cheap black rubber that doesn't fit bottle openings and is probably the reason the seals don't work because you have to jam them into any bottle opening misshaping the rubber.They arrived in tied plastic bags with no labeling. This seller probably bought 1000s of these knockoffs and sells them as vacu vins. Don't waste your money. The cost is just cheap enough that you won't want to bother sending them back, so let this be a warning.