The perfect size for a carry-onFor the most part, that 40L backpack that may seem way too small to fit your life into is just small enough to sneak on a plane without checking it into the hold luggage.
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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.
A 40 liter backpack is the best size for traveling in Europe as it's small enough to fly carry-on only. If you aren't up to the challenge of travelling with a 40 liter pack, you just need to make sure that you choose a backpack you will be comfortable carrying for long periods of time.
What is this? Ryanair say the size of the free small carry-on bag is 40 x 20 x 25cm and can be a maximum of just 20 litres and I quote from their website 'must be able to fit under the seat in front of you.
A 40L backpack is your perfect weekend companion. With clever storage, you'll have plenty of room for a sleeping bag, solo tent, camping mat, food, and extra clothing and layers to keep you comfy. You can take 40-45L backpacks as carry-on for flights.
It is the perfect size for travel, just don't pack it full. A 40L backpack half empty weighs essentially the same as a 20L backpack stuffed full. I did 4 months abroad with a GORUCK GR2 34L a few years ago.
Most airlines allow carry-on luggage that measures up to a maximum of 22 x 14 x 9 inches. In terms of volume, backpacks that are 40-45 liters are good as a carry-on. Anything bigger than that might require you to have it checked in instead.
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.
In most cases, the compartment size may range from about 35 to 45 liters. In some cases, the bag may also have an expandable pull string storage for more space.
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.
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.
Trips of 5 days or more usually call for packs of 70 liters or more. These are also usually the preferred choice for winter treks lasting more than 1 night. (Larger packs can more comfortably accommodate extra clothing, a warmer sleeping bag and a 4-season tent, which typically includes extra poles.)