diagonal row of interconnecting bubbles contains bubbles a 1 through a 5 typically the sheet 10 will be about 1 5 meters wide which means that a single diagonal row of bubbles may contain as many as sixty bubbles the drawings are not intended to illustrate an actual bubble sheet but represent instead a schematic example for purposes of explanation by way of example only if the bubbles 12 are formed as one inch hemispheres the conduits 14 may be semi cylindrical forms about u215b inch in diameter and channel 15 about u00bc inch in diameter they would also be vacuumed formed during the process of manufacturing the bubble layer this would mean that the roller which contains the female hemispherical dies for forming the bubbles would also include comparable female semi cylindrical dies for forming the conduits 14 and channel 15 it is also contemplated that the conduits 14 and channel 15 may be formed in the base layer 16 either in whole or in part after the bubble layer shown in fig1 has been formed it is joined to a base layer 16 in conventional fashion to form a bubble sheet fig2 and 3 the base layer 16 contacts the bubble layer only in those regions which are u201c flat u201d i e the regions outside of the bubbles 12 conduits 14 and channel 15 typically layers 10 and 16 are thermally fused together in accordance with the invention after the bubble sheet has been formed the bubbles are deflated so that the sheet can be shipped in.