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Power kiting is an extreme sport with many ways of getting an adrenaline rush but it also pays to be prepared for those less than successful landings.
After your course it would be advisable to get all the above items. It's no use saying "I'll get it someday" and when that day arrives and everything is still on a shop shelf somewhere. If you have it to hand - you can use it. Plus you'll look like Mad Max. Dead chic ;)