Adjustable cup holder

An cup holder for a variety of beverage containers adjustable to accommodate a wide range of container sizes and types. The holder comprises a back plate 10, an upper bracket 30, a lower cover plate 40, and an adjustable door-mounting bracket 20. The upper bracket 30 comprises a pair of extendable opposing arms 31 and 32 extending horizontally from the upper bracket 30 at an angle less than perpendicular, defining an adjustable space between them for insertion of a beverage container. A snack attachment mechanism 37 is provided on one or both arms. The upper bracket 30 with extendable arms 31 and 32 is folded downward against the back plate 10 when not in use. The lower cover plate 40 extends horizontally and serves as a platform on which a beverage container may rest, folding upward over the upper bracket and against the holder back plate 10 when not in use, presenting when closed a covered and protected beverage holder. The door-mounting bracket 20 is adjustable with overlapping plates, one sliding into side grooves of the other, with a set of matching grooves 27 and extruding serrations 28 on facing surfaces to prevent unwanted sliding.