i think its fine except for say if u were to leave the kite in a hot car, i think the heat could make them expand and possibly burst, although i'm not 100% on this, i'm sure somebody else will know for sure.

i'd generally just let abit of air out of them just to be on the safe side.

It ok to leave them as long as the temperature is not too hot, but if you leave them in a car in summer the temp in a car can be very hot and as you know air expands when the temperature increases.

I guess Carbs is correct too, but when I sold my kites and told the buyer that they were not miss treated I could sleep at night knowing that was the case.

Up to the user though, but it only takes a short time to infate its not that hard.