Can you bring a 35L backpack on a plane?

Dimensions for carry-ons vary by airline, but a good rule of thumb is that any backpack less than 45 liters should fit most airlines (but be careful with ultra-budget airlines — especially in Europe). Any bigger than that, and you risk extra charges.



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30L-35L: There are a handful of travel backpacks in the 30L-35L range. In my opinion, these are still too small for most travelers. Bags in this range are best for minimalist travels or travelers who use a suitcase but still want a smaller backpack for extra stuff.

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Typically, the bag must be within the cabin baggage dimensions of around 22 x 14 x 9 inches (56 x 36 x 22 cm), commonly considered the standard size for carry-on. Any bag within this dimension can fit most aeroplanes' overhead compartments.

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Some airlines also publish weight limits. 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.

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Not too big, not too small–the bestselling Allpa 35L is just right. It's carry-on compatible with most airlines (minus smaller regional flights), and it's great for trips up to about 2 weeks long.

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21–35 liters: This is the sweet spot for most hiking and travel daypacks. There's enough capacity to hold food, clothing and some extras, like a camera and a book. 36–50 liters: These larger packs are ideal for trips that require additional clothing and gear, such as climbing, mountaineering or non-summer hiking.

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The L stands for Liters. So when you see a 25L backpack, that means the capacity of the main pouch is 25 liters.

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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.

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BACKPACKS BETWEEN 35–50L If you want to embrace the 'packing light' philosophy on multi-day hikes, this size will still work for you. You'll need expensive light-weight gear to make this work, though. If you're sure not that everything you need will fit, then choose a backpack that's 50L or larger.

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American Airlines
According to airline policy, any personal items stowed beneath seats should not exceed 18 inches by 14 inches by 8 inches.

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A Spacious Underseat Bag
Luckily, Tortuga makes backpacks that work as underseat carry ons. 30L or 40L backpacks are great options for primary carry ons but are usually too big to be considered personal item that need to be small enough to slide easily under the seat in front of you.

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Ultimately, most 40L or 45L duffel bags will fit as carry-ons, especially the ones (like a duffel bag!) that are soft enough to shift shape slightly. You'll need a very soft, squishy duffel or a small backpack if you plan to use a duffel as an under-the-seat bag.

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Make sure one of your bags qualifies as a carry on and the other as a personal item. Then you can travel with two bags and zero worries.

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Their dimensions also often fall under the maximum carry on requirements for peace of mind when traveling light. We recommend using a 30 liter backpack carry on as its often just the right size for airline bag requirements.

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