Spirit Airlines allows a personal item for all travelers that must not exceed 18 inches x 14 inches x 8 inches, including handles and wheels. On United Airlines, personal items cannot be larger than 9 inches x 10 inches x 17 inches.
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Firearms, ammunition, and fireworks are prohibited, as are all knives and safety razors (including pocket knives and Swiss Army knives). Straight razors and replacement blades for straight razors are also not allowed. Most tools also cannot be packed in carry-on luggage, as they have the potential to cause harm.
A personal item is any type of luggage that fits underneath the plane seat in front of you. Most domestic airlines in the United States require a personal item to be 18” x 14” x 8” or smaller in size. Personal items can include a purse, briefcase, small backpack, laptop bag, weekender or small duffel bag.
In general, travelers are permitted to bring into the plane one personal item and one carry-on bag with them on most flights. The personal item is often a small bag, such as a handbag or laptop bag, that is able to be stowed away beneath the seat that is directly in front of you.
Small personal itemThe airline states it cannot be larger than 40 x 20 x 25 centimeters (15.7 x 7.9 x 9.8 inches), but there is no weight limit. It should be stored under the seat in front of you.
So, yes, if your backpack is small enough that you can fit it under the seat in front of you, then it's a personal item. This designation becomes especially important when you're flying on a low-cost carrier or have booked a basic economy ticket on a larger airline.
Usually, many airlines won't check every carry-on but will instead go for ones that look oversized. If your luggage does not fit in the sizer, you might have to pay a checked bag fee along with the gate checking fee and have your bag transferred to the airplane's cargo.
It's easy to determine the size of a 20kg bag in Ryanair, since they have a very specific policy. Ryanair's maximum checked bag size is 55 x 40 x 20 cm including handles and wheels. It also has a maximum weight of 20kg. So as long as your bag adheres to these measurements, it should be accepted as a 20kg bag.
While most backpacks, purses, and briefcases can pass as personal items, a large camping backpack probably won't fit under the airplane seat. Most airlines publish specific measurements for what counts as a personal item.
Ryanair gives examples of a 'handbag, laptop bag or small backpack'. The airline states it cannot be larger than 40 x 20 x 25 centimeters (15.7 x 7.9 x 9.8 inches), but there is no weight limit.
Ryanair Carry-on Bag Size AllowancesYou are allowed a single personal item, like a backpack, however, your Ryanair cabin bag can't be larger than 25 cm x 40 cm x 20 cm.
Backpacks, totes, and crossbody bags are typically considered personal items too. The key to remember is it must be able to fit underneath the seat in front of you. A carry-on is a type of hand luggage that you bring into the plane cabin with you and is larger than a personal item.
If your carry on is a duffle bag or suitcase, a personal-item-sized backpack is the perfect secondary bag and will fit nicely under the seat in front of you. Plus, you can use the luggage pass-through sleeve to attach your bag to your suitcase for effortless travel through the airport.
According to the TSA What Can I Bring page, there are no specifications for certain water bottle materials. As long as the water bottle went through the security checkpoint empty, you can fill it up in the airport and bring it with you on the plane.