WHAT I USED:
For the bags I purchased the ones below on Amazon. I also decided to purchase a sealer for extra security for the bags since I was mailing them. I really didn't want my family to open the box and find all the ingredients had merged together. But that could be my OCD talking :).
As far as the labels. I made them myself. I used Adobe Illustrator to make them, but it's just as easy to use Microsoft Office. Just open a new document, draw a text box and insert the text. Make sure the border on the box is a little thicker and then when you cut them out, cut just outside the line leaving a white border. I used full sheet sticker paper in my ink jet printer.