These adhesive Flip Pockets come in really handy when you have more photos that can fit onto one spread, or if you want to add some intrigue and mystique to your page. They allow you to add flaps for additional photographs on the outside of the plastic page protector while still protecting the additional photographs.
Here are two good options:
Simple Stories – SNAP Studio Collection – Photo Flips Variety Set – 12 Pack from Scrapbook.com
Buy C-Line Memory Book Scrapbook Flip Pockets for 4 x 6 Inch Photos, Clear, 6 per Pack