Cannot exceed 45 linear inches (9 inches by 14 inches by 22 inches)
http://www.nwa.com/travel/luggage/carryon.HTML
the largest size airplane bag you possably could carry on is probably a 1 1/2 foot long and 1 foot wide bag. i measured the airplane size box so that's pretty accurate!
It has to be under 50 pounds..
The average size of a weekender bag is the size of a carry on bag that is allowed inside the cabin of an airplane. These bags can be no larger than twenty-six inches by fifteen inches by ten inches. The bags should be small enough to carry easily and large enough to carry necessities.
no, they're a harm to the society
No, not if they are a small size. If the gem or earring is large, you probably shouldn't be wearing them on airplane anyway.
limit size of bag
Yes, it is not an illegal or dangerous weapon.
Check with the airlines as to what they allow you to carry on.
3 oz. if you carry it on. but if you check your bag I don't think there is a limit
You can definitely take a harmonica along with you.
Yes two bic style lighters are allowed on your person or in your carry on bag.
Yes. As long as your duffle bag is within the airline's size requirements for carry on luggage, you can use a duffle bag as a carry on item.
The Space bag Jumbo Size Vacuum Bag is ( 35" X 48" ).
A carry on luggage basically is a bag that can be carried and bears the size of a bag that can fit inside the luggage compartment of the airplane.