Before I start, I should say that I regularly use vacuum seal products for out-of-season clothes, and know how to operate them.
This arrived: - without a brand name - with inadequate instructions ('close the seal' - it should confirm how) - with an inadequate seal clip (the small clip that is drawn through the bag opening to close it). Eventually I had to use the seal clip from another, better product from a different seller.
Upon trying it several times with a few dresses (so not too many items) it became clear that the valve simply didn't work, and the bag leaked immediately.
Upon contacting the sellers, they could only send me a returns label and did not contact me to confirm that I'd be guaranteed the product price and the postage price. I contacted them again but haven't heard anything from them.
In summary: awful customer service, awful product. Waste of time and money. If I could give it 0 stars, I would.