Slip cover ottoman that opens up for storage. A new cover at Ikea is $30. This one could cleaned up with some bleach.
Ikea Ektorp Footstool
https://www.ikea.com/ca/en/catalog/products/S69164904/
Ikea Ektorp Footstool Slip Cover
https://www.ikea.com/ca/en/catalog/products/50322263/