I shipped two longbows today... 3" pvc pipe cut to 73", including any end cap. Padding in both ends and a cut out, tapered wood end piece inserted. The circumference of the 3" pipe will be 10 1/2", making the final post office measurement of the package a total of 83.5", just under their cutoff point of 84" for oversize charge. cost was $15 per, plus insurance. I wrapped the tip before sticking the bow in the tube, wrapped each limb with upholstery fluff, then tucked fluff around the other tip before taping the wood end on.
Now, if you shoot those bows with the bent ends, it ain't that easy, and the only advice i can give you is that if you would stop standing them in the closet, the ends would stop bending...
Dick in Seattle