Print Sales: What is your postage (shipping) preference?

I am looking into selling prints of my work and I would be interested to know how you send your prints to your customers.

I presume that up to A4 could be sent reasonably safely in a rigid envelope, but what about larger sizes such as A3? Do you use a tube, and if so, what diameter is best to minimize problems with flattening out the print at the other end?

Thanks

Mike

I use the same tube my lab mails things to me in. 8x12" or smaller is in a rigid envelope.

Okay, thanks.

What diameter tubes to they use? I'm looking for suppliers at the moment, so I wouldn't want to get the wrong size. My main concern is avoiding problems with flattening the print out at the other end.

Mike