Even if you're a heavy packer, you should be able to take a 45L pack away for a weekend. A light packer could easily do with a bag like this for a week. With that in mind, here's a packing list for what you can fit in a 40+ backpack.
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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.
As a rule of thumb, 25-30 liter backpacks are best for shorter weekend trips, while 30-45 liter backpacks are best for longer trips or long-term travel.
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.
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.
24-26 liters is considered a medium-size backpack and is probably the most popular bag capacity out there. It's great for taking to school or work, depending on the styling, and can also be a great travel pack for taking on a plane.
Bottom Line. Is a backpack a carry on? In many cases, as long as it's not larger than about 55L, yes, you can use many backpacking backpacks as a carry on.
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.
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. Other things you'll need to carry include a small stove, food and basic cookware, plus a water filter/purifier, first aid kit, and navigation tools.
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.
? Flight Approved Carry on Backpack: Size of travel backpack: 20.47 x 12.99 x 8.66 . Capacity: 35L. This luggage backpack is meet the allowed maximum size of most IATA flights and also fits in the overhead compartment and the underseat in flight.
25 - 27 Checked LuggageThey are ideal for trips of 5 to 7 days, or longer, depending on how you pack. They have a large capacity for multiple outfits, shoes, and toiletries.
Large suitcases have a height of around 75cm. These suitcases are ideal for a 2 to 3-week trip, like to the French Riviera. The suitcases have a capacity of about 75 to 91L, which equals to about 15 to 20kg of luggage.
For a multi-day, or weekend hike, a 45L to 55L backpack offers enough volume for the average backpacker. The extra capacity allows for carrying more food, water, fuel, and some comfort items you might leave behind for a single night trip.
This is why most new backpackers think they need a larger backpack to travel, but with some clever organising and good packing cubes, a 40L backpack could just be the perfect size. You'll be incredibly surprised at just how small of a space you can fit everything you need for 3, 6 or even 12 months.