An improperly stored pigging string can put a kink in your whole run.  Be sure that your strings are stored and shipped properly to avoid problems.  If you order your strings from Coolhorse, breathe easy knowing that your strings are stored straight and not coiled, kinked, or twisted.  Ricky Lyles has advised us of the best way to ship your strings.  They will never be shipped in a box that is not at least 10" x 10".  A rectangular box can cause areas of more and less curve.  A square box allows the string to rest at the same curvature through it's entire length.  A rope can or rope bag with a round shape makes the best storage for your strings for the same reason.  For long term storage, a section of PVC pipe makes a good tool to protect them and keep them flat.