I've got some prints in Mayfly's new shop in Temple Bar, Dublin. The new location is on the ground floor of the Cafe Irie building, just off Temple Bar Square and worth checking out, lots of funky stuff in there. The prints are 14cm x 21cm (approx. A5) on lightly textured Daintree paper with images from a selection of recent watercolours. I've only a handful in at the mo, working on getting more for them.
Packaging is always a bit of a pain to come by. Regular readers hear me complain enough about disposable plastics, so I'll not go into it, but lets just say I'm not too keen on being a source of plastic waste. However, one must ensure one's work is presentable and protected from the elements. Usually I'd just use secondhand plastic pockets (they pop up every now and then in charity shops in folders and binders) I haven't come across any in a while though, so for these prints I had to make up my own.
I've used plastic covers from old photo albums, and reclaimed waste card from a framers. I cut the plastic sheet to shape, form an envelope and stick with double sided tape. I tried glues, but the tapes much neater. And I'm no fan of glue anyway. The card provides support.
When I've a larger supply (making the envelopes is a little time consuming), I'll put some up on Etsy for sale.