Here's the Flexi bag, as well as the Bone Bag (TM). The Bone Bag has the surfer print fabric sewed over heavy corduroy fabric. The corduroy should keep anything from ever cutting through and getting to the kite.

Cost, $4.00 for 2 yards of corduroy (was on the cheapo rack), $6.00 for 2 yards of the red/white fabric, maybe $0.75 worth of nylon rope, and an $80.00, entry level sewing machine that one of my fashionista daughters wanted anyhow. Already had the black spray paint and the stencil set.

Took about 20-30 minutes to make on a day with no wind anyhow.