I saw these on-line the other day.
https://www.walmart.com/ip/Nuv....
Look like they might work provided they are big enough to cover your plants and sit snugly on the ground. Might be light enough to get lifted up and even knocked over in strong wind, however. Haven't tried them myself. And to store them, they would clearly stack on top of each other like stacking chairs. I usually just use blankets, buckets and large cardboard boxes as we get so few hard freezes.
The larger size isn't terribly expensive either:
https://www.walmart.com/ip/Nuv...
