I've gotten triangular boxes that looked like that too. The sail won't get hurt when that happens, obviously, but the number of frame pieces can increase substantially. Using a PVC tube inside the box to slip either the entire kite, or just the frame into will make it bulletproof, but adds quite a bit of weight which increases the shipping cost. Other option is to include a stick or dowel that's relatively strong to the shipment.
Ouch! I had a SUL come in a tube that had this dispairingly large dent in the side of it. The kite was unhurt. I was relieved. When I ship kites I make sure that there is a couple of layers of bubble wrap around the kite itself.
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Today I learned that shipping a kite should be done in a triangular box or tube. I've recently made a couple kite purchases and they've all come in either triangular boxes or tubes and they've all arrived (boxes included) in tact... up until today.
Today one of my most recent acquisitions came in a rectangular box. This was the result:
Luckily, even with the damage to the box the contents was not harmed:
New Old Stock TRLBY Single!