creamcorn said:

do you have to declare an envelope contents to customs or is that only a package?  i know spore trade happens between borders all the time without problems but i'm paranoid... i'm all about donations but i'm all about not raising any eyebrows as well.

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If you individually bag your prints in mini ziploks (cardstock prints), you can get about 10 or 12 in a regular envelope. If they are just on foil you can get 40 or 50 in that same envelope and no customs sticker is needed. Just be sure to get it wieghed for the correct postage.
If you send your prints in a padded envelope, it will require a customs sticker.
Most I see are labeled "Printed Material" or "Educational Printed Material" or even "Prints - Photos", it's a stretch, but pretty much true. Value $5.00 or less, Sent as a gift or sample.

If your in Canada, and sending a large padded envelope filled with prints... no customs sticker is needed at all. Just always remember to get your package wieghed for the correct postage.

Ok... I'll watch for all those large envelopes now

Take Care Guys!
Shdwstr