A cheap bag to prevent cross pollination
I have been experimenting with hair bouffant caps that are used in hospitals and in food preparation. They are made of a spun mesh and the holes are much smaller than mosquito netting and much lighter. I got the 24" size and it's pretty roomy. They have a pretty strong elastic band around the bottom. If you look carefully, you can see where the 2 ends of the band is. Expose the 2 ends and use them to pull the bottom of the net up snugg around the plant stem. If you have a really big flower head, this may not be big enough. It can also be cut to size if too large.