Ikea offers the best cases for small spaces and also the best bookcases for large spaces. The best Ikea bookcase is Billy. This bookcase, developed in 1979 by Gillis Lundgren, has withstood the test of time and has sold a whopping 60 million units worldwide. This versatile bookcase is made of particleboard with polypropylene plastic foil on the surface and melamine foil on the sides. Here, the user may adjust the height of the shelves as per the needs. The Billy bookcase standard unit measures 80 cm wide, 28 cm thick, and 202 cm high. Moreover, the Billy height extension unit, available in the same width, offers additional vertical height and storage capacity. Also, a combination of Oxberg with Billy gives doors to the celebrated bookcase. All Ikea bookcases have easily portable packages.