I’ve seen lots of these vases around where the water pressure holds the plastic bag shape open for your flowers, but this one is different. It can be shaped and “frozen” in place, then “unfrozen” and collapsed back down for storage.
Collapsible Vases are heat and cold activated plastic. Fill it with hot water to mold it into the shape you want, then dump it out and refill with cold water to allow it to keep its shape. When you’re ready to put it away, hit it with hot water again and you can smooth it down flat for easy storage. 11 x 6 inches in blue or green. One is about $7, and they go down in price if you buy 3 or more.
Image: Lee Valley Tools