Today airline passengers travelling on "low cost" airlines do not want to waste their precious luggage allowance checking in heavy suitcases. Many low cost airlines restrict passengers to exceedingly low permitted weights of check in luggage. Ryanair allow 15 kilo and charge $20+ per kilo for excess. There is a market for a strong ultra lightweight wheeled carrier combined with for an ultra lightweight bag. Ideal would be a "hi tec" folding wheeled carrier which can be used in combination...