similarly one or more of the panels 261 262 263 264 could have one or more opening 227 for a window panel 225 the window panel 225 would preferably be in an hinged arrangement with the sleeve panel 261 262 263 264 such as along a fold line 226 which could act as a hinge 226 each of the sleeve panel 261 262 263 264 would have an edge area to allow for the secure mating of the adjacent panel to it thus first sleeve panel 261 would have a first sleeve edge 261 a and a second sleeve edge 261 b and a second sleeve panel 262 would have a third sleeve edge 262 a and a fourth sleeve edge 262 b and a third sleeve panel 263 would have a fifth sleeve edge 263 a and a sixth sleeve edge 263 b and a fourth sleeve panel 264 would have a seventh sleeve edge 264 a and an eighth sleeve edge 264 b thus for example the first sleeve edge 261 a would mate with the second sleeve edge 262 b and the third sleeve edge 262 a would mate with the fourth sleeve edge 263 a and the fifth sleeve edge 263 b would mate with the sixth sleeve edge 264 a and the seventh sleeve edge 264 a would mate with the eighth sleeve edge 261 b thus once the all the edges of the panels 261 262 263 and 264 are mated to form the sleeve 220 shown in.