The invention relates to a roof box (1). Roof box (1) has a housing with a main cavity (2) for housing sheet material. The housing has front and rear end walls (4,5) and opposing side walls (6). Connection means (20) are provided to connect the housing to a vehicle. An opening (9) is provided through which sheet material can be introduced into the main cavity and one or more rollers (10) may be provided at or adjacent the opening. The side walls may extend outwardly at or adjacent the rear of the cavity. A pair of elongate secondary side cavities (12) and a front wall member may be provided on top of the main cavity to create a loading space therebetween. A rear holding plate may be removably located in one or more sets of slots provided in the elongate secondary side cavities. The elongate side cavities may be extendable.
