Storage solutions - advice needed

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I need to get some reasonably priced storage cubes for the dc's rooms. would like the ones that can have canvass boxes but also be used for books etc. some of those i have looked at on line seem quite small. anyone got some good ones and can recommend?

IKEA? Can't remember the funny swedish name but lots of people have them and they also sell the canvas boxes to go in them, which is useful.