Luggae is a considered a singular subject. It will be followed by a Singular verb.
'Is'.
Your carry on luggage should have a lot of pockets and alot of compartments to it.
Yes, according to the TSA site, you can bring with you your knife but it should be in the checked luggage and you shall declare it in the check in counter and as such should be well sheathed to protect bag handlers when handling your luggage.
When traveling for business, be sure to label your luggage with business luggage tags. You should even tag your carry-on luggage in case you misplace it when you are in the airport. It is beneficial to label the luggage with your business name so that the luggage can be sent back to your company if it gets lost in transit. You should especially mark your laptop bag, since this would be a very expensive item to replace. Make sure that you include a phone number on your tag so that the airline can call you immediately if they find your lost luggage.
If you use your luggage a lot then it depends on how you handle the luggage be careful with it. However, if you only use your luggage a few times a year it should last a very long time.
Luggage should be bought depending on your travel and the contents you will be carrying in it. The duration of your travel, convenience and budget plays a vital role in selecting the ideal luggage.
Luggage should last a good amount of time, it also depends on how much you travel and how much wear and tear is on the luggage itself. If you travel at least a couple times a week your luggage is susceptable to more damage because of the risk that is taking when traveling numerous times during the week. If someone us using their luggage a couple times a year then their luggage could last them years.
I believe that Polycarbonate ones are more durable. Especially in hardside luggage. They are also lightweight and they can protect better the things inside your bag.
in the carry on
Never check your laptop with your luggage.
your luggage, money in case you have to eat there
Neither
Some things you should never pack in your checked luggage are money, jewelry, credit and debit cards, and travelers checks. You should also not pack prescription medication in your checked luggage.