With the purchase of each original Bogg Bag you will get two clear insert bags. One large insert bag that is 9.5 " x 11.25 "x 2.5 ", perfect for cell phone, book, keys or even a 8 oz bottle of sunscreen. One small insert bag that is 5"x 7" x 1.5", just the size for change, ID, credit cards or chapstick. Simple snap the insert bags into any free hole of the Bogg Bag using the buttons on the back of the insert bags. You can even snap them on the outside of the bag to keep them at reach.