Do Kallax Inserts Fit Billy?

The other IKEA storage unit box that fits will in the Kallax is the Bullig. The Bullig is a nice looking bamboo box with a smooth exterior and felt bottom. It's the same size as the Droga, so you can count on it to hold a lot and fill up your Kallax shelf. The Bullig is sturdy and held together by several screws.

Does Billy fit Kuggis?

Fits BILLY bookcase and other units with shelves which are at least 18 cm deep.

What size inserts for kallax?

Insert with door, white13x13 " (33x33 cm)