Musing on the options for this month's tiny sustainability improvement.

I know a couple of you dear readers have been experimenting with reusable mesh bags. So how has the experiment been working? What are the advantages and disadvantages? What presumed actions have to be part of your weekly habit for using these to work (other than the obvious taking them to  the shop)?

If you sewed them, what construction techniques and materials were used, and what worked or didn't?