Remember no more than 10 ounces of carry on baggage are allowed.

记住随身携带的行李不能超过10盎司。

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There are of course city buses, however, these may not allow you to carry on baggage.

当然有市公车，然而，这市公车可能不准让你带行李上去。

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Another factor may be that more people are trying to overpack their carry-on bags to avoid checked baggage fees, though the airlines strongly dispute this.

另一个可能的原因是，虽然航空公司强烈反对，但更多的人还是会为了逃避托运行李的费用，而把随身行李塞得满满的。

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Homeland Security Secretary Michael Chertoff said yesterday, he doesn't think there needs to be a total ban on carry-on baggage, because the restrictions on liquids and the extra training given to screeners means passengers can be protected without stopping them from bringing anything on the plane.

NPR: U.S. Clarifies Security Rules for Air Travel

America's Department of Transportation is planning a rule change from October 1st to allow passengers and crew to bring fuel-cell-powered electronic devices and one or two fuel cartridges on board in their carry-on baggage.

ECONOMIST: Consumer fuel cells

No knives of any kind will be allowed on aircraft, and all carry-on baggage will be subject to search.

CNN: FAA imposes restrictions on e-tickets