Air pockets in trogan magnum condom?

ok so i tried on a trogan magnum condom in it seems to fit around the base on up to the upper shaft. but wen it gets toward the head of the penis it an air pocket .. i know dat ther should be a air pocket at the top for the *** to go into .. but im not sure about the air pocket .. and also there air a lil other air pockets going up the shaft .. my penis is 7"s long and 5 inchs around the base is this condom to big???