Shelves

Product Overview https://www.ikea.com/us/en/cat/kallax-series-27534/

Customization https://www.ikea.com/addon-app/kallax/latest/#/m2/us/en/?

It can have some half-shelves https://www.ikea.com/us/en/p/kallax-insert-with-1-shelf-white-20423720/

Boxes can be used for flexible storage https://www.ikea.com/us/en/p/kuggis-storage-box-white-60394947/ https://www.ikea.com/us/en/p/tjena-storage-box-with-lid-white-40469302/ https://www.ikea.com/us/en/p/droena-box-white-00306270/

It can have inserts and drawers https://www.ikea.com/us/en/p/kallax-shelf-unit-with-10-inserts-white-s09278338/

Inserts https://www.ikea.com/us/en/p/kallax-insert-with-door-white-20278167/

Drawers https://www.ikea.com/us/en/p/kallax-insert-with-2-drawers-white-70286645/