A 75 liter luggage is considered somewhat large to be carried into the aircraft cabin and it will most likely have to be checked in.
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The design of the 70L is perfectly suited for airplane carry-on or check in, and the features of the 70L are perfect for any adventure once you arrive at your destination. Being able to compress the 70L allows you to use it as carry-on for all major airlines in the US and Canada.
So as stated, if your bag as packed ('condensed') does not exceed the maximum linear size as stipulated by your airline then there should be no hurdle to using an 85L backpack. The ideal volume for a backpack is a function of its dimensions. Most airlines allow carry-on luggage up to 22 x 14 x 9.
If you will potentially need that extra capacity on a future trip, then definitely get the 75L pack. If you're doing it just because it doesn't seem like much extra weight, even if you don't expect to ever need it, I would go for the 65L pack. That would also curb the temptation to overpack.
The Average Traveler: 30-40 LitersFor the average traveler who likes to have some clothing choices and prefers to bring a few extra items, a carry-on luggage with a capacity of 30-40 liters is usually sufficient. This allows you to comfortably pack clothing for multiple days, including shoes and toiletries.
A 40l bag can be brought on most flights as a carry on and used as a daypack when walking around a city. An 80l bag needs to be checked and then locked in the hostel each morning.
Volume: A 45L backpack is the maximum-sized carry on allowed on most US airlines. For international or budget airlines, choose a bag under 40L. If you want to pack ultralight, anything 35L or under can be carried on virtually any airline. Dimensions: The common 45L volume is usually measured as 22 x 14 x 9 inches.
Your backpack will generally be allowed as a carry-on if it's under 50 liters, or about 22 x 14 x 9 inches. Get a 45-liter backpack if you want to carry as much stuff as possible on the plane with you.
While personal item size restrictions vary across airlines, most airlines consider a small backpack, purse, briefcase, or laptop bag to be a personal item. These must always fit under the seat in front of you. Many airlines restrict passengers to one personal item and one carry on bag.
Can a 60L backpack be a carry on? Yes, a 60L backpack can be taken as a carry on. But since it is a larger bag, you will most likely have to pay extra depending on the airline. As there is a limit on the size of your free carry-on baggage.
- 60L large capacity with external stores system, enlarge your bag's capacity to accommodate more things. - Full bag size: 74 x 20 x 32cm / 29.1 x 7.9 x 12.6 inches.
Europe. European airlines tend to be stricter than US airlines, especially about luggage weight and personal items (which are sometimes not allowed). Avoid getting your bag weighed if possible (see the tips above). Air France: 55 x 35 x 25 cm (22 x 14 x 10 inches), 12 kg (26 lb).
The 40L will max out carry on dimensions on most airlines so you never have to check a bag. For stricter airlines, like RyanAir, 30L will be a better choice.