I print labels via PayPal and cut/tape them to a bubble mailer. It doesn't take me very long.
Back when my craft room was organized I had a separate shipping area. The bubble mailers were stacked nicely. The jewelry boxes, stickers, address stamp, customs forms, pens, scissors, etc. were all in reach. And I had a nice empty surface to work on.
Here's a picture of how it used to be:
http://elite-art.blogspot.com/2011/01/where-products-are-shipped.htmlIf I have a lot of orders at once I would print all the shipping labels and invoices, then tape the label to the mailers, than gather the packaging and each item and set them on the coordinating envelope, and then individually package each one so that I don't mix anything up.