The set contains one large insert bag with 3 white buttons across the back and one small insert bag with 2 white buttons across the back.  Simply snap the buttons on the back of the insert bags into any free hole on the Bogg Bag (inside or outside) to keep smaller items in reach. The large insert bag measures 9.5 inches high, 11.25 inches wide and is less than .25 inches deep when flat but can open up to accommodate approximately 2.5 inches. Suggested uses for the large insert: cell phone, book, keys, 8 oz. bottle of lotion The small insert bag measures 5 inches high, 7 inches wide and is less than .25 inches deep when flat but can open up to accommodate approximately 1.5 inches. Suggested uses for the small insert: smaller cell phone, change, credit/store cards, id, chapstick. Tip:  To install the insert bag into any of the holes on the Original or Baby Bogg Bag simply push it through the holes anywhere you choose.  To remove, simply use your thumb to push it back through the hole.  The white snaps do not need to be unsnapped to install or remove.