I posted this on the Rick Steves Grafitti Wall where there’s been some interest in the Save the Carry-on petition:
My reasoning (for the petition) is that 1) if Canada can do it, so might other countries, and 2) the fact that the underwear bomber checked no luggage is constantly mentioned in media accounts as a “red flag”, and 3) there are reportedly members of Congress (possibly under the influence of the fee-happy airlines, flight attendant unions, or shipping companies) who would look favorably on carry-on bans or draconian luggage restrictions.