The large insert bag measures 9.5" x11.25" x less than .25" when flat, but can open up to accommodate approximately 2.5". 

Suggested uses for the large insert: cell phone, book, keys, 8oz bottle of lotion

The small insert bag measures 5" x 7" x less than .25" when flat, but can open up to accommodate approximately 1.5". 

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 should not be unsnapped to install or remove.