performance of the ffcv the towing force should be minimized as a function of towing speed commonly ffcvs are designed to look something like a submarine this is to say that ffcvs have a tapered bow and stern stability is important as a towing phenomenon known as snaking can destroy an ffcv by way of uncontrolled sinusoidal oscillations the shape of the ffcv will determine if the bag will be stable during towing while the aforesaid patent applications discuss the various forces important in the design of the ffcv the present application is directed to methods of closing the bow and or stern of an ffcv the present invention envisions a tapered structure whilst avoiding stress concentrations or otherwise compromising the integrity of the tube in addition the tapered portion may be so formed so as to be integral with the tube and by forming it out of the tube itself creates a mass of fabric particularly at the bow portion where the stress load is the highest such a mass of fabric allows the ffcv to distribute the load placed thereon and avoids the need to affix separate end caps with this in mind we turn now to the general construction of the tube 12 which will make up the ffcv in this regard and as disclosed in the second aforesaid application the tube 12 may be woven seamless it may also be knit or braided seamless as an integral piece large textile looms such as those owned and operated by albany international corp for making papermakers fabric can weave such a large tube 12 the particulars for its fabrication the material used the.