128 in this embodiment the rigid connector becomes part of the joining means that maintains the distance of the tube sets apart as in fig1 0039 fig1 is a somewhat broader embodiment for suspending a weight between the sets of dual tubes as shown in the suspended seat type float tubes of fig1 and 15 for such suspension seats the attachment zone of the seat to the tube sets results in variable torsion effects on the tube sets it has been found that the invention tensioning is sufficient to permit attachment of the suspension seat to any of the radial surface points of the covering 110 without resulting in substantially adverse downward deflection of the inside tubes 115 with upward deflection of outside tubes 114 suspension sling or other means 130 and 132 are attached respectively at points 131 and 133 on covering 110 means 130 and 132 in the weighted state tend to pull covering 110 in direction 136 around the general radius of the tube sets which rotation inducing pull is negated by the appropriate tension of covering 110 and connection of the tube sets to joining means similarly suspension sling or other means 134 attached at points 135.