Good size, fits a comforter a throw and about 3 small pillows. There is an insert that slips into the center of the inside of the ottoman. The instructions say that it needs to be in place for the ottoman to support the amount of weight specified which is over 600 lbs. The insert does take away some storage space but very little. 
The reason I did not give it 5 stars is because the insert doesn't sit in the ottoman very well. It only firmly slides into one of the vertical runners that are on the sides of the ottoman. However, it's still a really good product for the price and looks great. It;s comfy to sit on as well.