Want this question answered?
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.
Hahaha, no!
limit size of bag
Can't say for certain. It depends on how big the carry on bag is and what plane you are on.
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.
No it is not allowed on a carry on but it is allowed on a checked bag or suitcase. If I were you I would put it in a plastic ziploc bag incase it cracks.
The majority of airlines have restrictions on the size of both carry on and checked bags. Passengers who plan to fly on US Airways should make sure their carry on bag is no bigger then 45 inches. If you have concerns there should be a measuring device in the check in line so that you can make sure your bag is the proper size.
If you're carrying it onto the plane, it's a carry-on bag. You are allowed one bag that fits underneath the seat and one additional small bag that fits into the overhead compartment.
no
Yes, you can. I have taken my camera on the plane before. But I don't think it is allowed to use it at taking-off or landing. You can use your camera during the flight, though.
Handcuffs are currently not restricted by the TSA in carry on luggage. I have carried large numbers of handcuffs in a carry on bag with no problems.
When traveling by airlines, carry on luggage are small enough that they can be stored in overhead compartments or hung in special places on the plane. The air stewards will show you where you can hang a plastically enclosed garment, such as a suit or overcoat.