end cap 24 is nested within end cap 26 and the two are applied to one end of tubular portion 28 of container 20 the remaining end cap 22 may be a unitary structure or may contain a nested cap not shown on strip 51 end caps 22 24 and 26 attach to protruding buttons on the outer face of wind shelter 10 the location of the securing buttons can be determined from the opposite ends of those buttons shown in fig1 at for example point 30 the configuration of the button is the same as that of the button shown in fig6 a as can be seen from fig2 end caps 22 24 and 26 have multiple apertures in the side walls thereof for example cap 26 has apertures 40 42 and 44 in the side wall 46 thereof the different positions of the apertures permits placing wind shield 10 on a uneven surface and adjusting the position of the ballast containers which end caps 22 24 and 26 become to fit the particular terrain this assures a stable wind shield structure the end caps turned ballast containers are filled with dirt or rocks 48 to assure stability for the structure they may be buried for stability the receptacle 50 in frame member 52 shown in fig1 a is provided for the purpose of receiving respective ones of the tips of the support elements making up the upper portion of an umbrella the combination can be seen more clearly in fig3 in which wind shield 10 has added to it umbrella 54 which has an.