Is a 45 liter backpack big enough?

For the average backpacker, an overnight trip will require 45L, assuming you do not have the most ultralight and compact gear. For a single night, you do not need as much food and water or fuel for cooking. And if you are someone who likes to pack extra clothes, you won't need as many.



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For a multi-day, or weekend hike, a 45L to 55L backpack offers enough volume for the average backpacker.

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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.

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40 liters is definitely big enough for traveling, as long as you're not an over-packer. It's a good idea not to go for an overly large backpack - overpacking can be as troublesome as under-packing.

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Most bags range from about 30L (1,800 cubic inches) all the way to 100L+ (6,000+ cubic inches). I recommend a backpack around 40L-50L. Personally, I wouldn't go over 65L, but some people like a bigger bag.

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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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2-3 Day Packs: 35-50 liters A weekend backpack like a standard 40L backpack is big enough to carry a backpacking sleeping bag, small tent, and pad, as well as extra clothing and layers.

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A 45L bag maximizes overhead space but can get heavy when fully packed; 35L bags tend to be more manageable. Clamshell designs open like a book and are easiest to pack, but bags that open traditionally tend to have more structure.

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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.

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Let's face it, most European airlines are pretty, pretty stingy when it comes to their carry on size restrictions. That's why we designed our Carry-on bag and Daily bag to comply with nearly all European carriers – as well as more generous American ones.

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With 10,000 USD, you could easily travel around Europe for a few weeks. You could stay in budget hostels and eat at local restaurants or cook your own meals. If you plan carefully and look for deals, it's possible to stretch that amount even further.

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Backpack size: 18×13.2×11.6; Capacity: 42L. With its large size and multiple pockets, this bag is ideal for storing your clothes, first aid kit, water bottles, food for 3 days and other survival tools.

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A 40L backpack sits in the sweet spot between lightweight daysacks and heavy-duty 80L rucksacks. They're extremely flexible – working for average day hikes and overnight wilderness camping. They also give you the extra room needed for climbing gear or winter hikes.

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