How much litre rucksack should I buy?

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.



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Understanding Backpack Sizes 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.

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Multiday Packs: 50-75 liters A light packer will have ample room for five nights or more with a multiday backpack, which is typically a 50L backpack or larger. These are designed to carry more food and cooking fuel than a weekend pack, as well as extra clothes and layers.

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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.)

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But, based on my own experience, 70L is too large for a carry-on item with most airlines. If you're looking for the optimal balance between the largest bag possible, and the most airlines it would be allowed on, I find that 35L (53x35x20-cm) is allowed on 155 of the 175 airlines I could find data for.

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70L is definitely too big. I believe the 55L is a 40L + a 15L daypack. This will probably work, but double check the length, width, and height, and make sure none of those dimensions are larger than allowed for a carry on.

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If you buy a 55 liter to 65 liter back from a backpack manufacturer than only counts their closed storage in their volume spec, there's a pretty good chance you can carry all of your backpacking essentials inside your backpack, including a bulkier synthetic insulated sleeping bag and a two-person tent.

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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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Size Matters (but Bigger Isn't Better) Like a few other things in life, size matters when it comes to choosing a backpack — but not in the way you might think. Based on many years of dragging excessively large backpacks around the world, I have to say bigger is not better. You do not need an 80 or 90 litre pack.

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70L Capacity Backpack normal size is 18.90'' L x 26.77'' H x 10.63''D (48 x 68 x 27cm).

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65 cu liters is 3966.5 cu inches and 85 cu li is 5187 cu inches...so I'd say 65 liters is pushing it. You'd need to check the dimensions or go with something like my ebags weekender convertible. but it does not have all the cinches/straps as a regular backpack might have.

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Large Backpacks: 40+ Liters
Large backpacks have a capacity of 40 liters or more, which is plenty of space for all your travel gear, even on longer journeys. If you're planning a backpacking trip for seven to ten days (or longer if you're travel-savvy and can pack light), this is the size you'll want.

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They're suitable for short breaks or extended trips. Most backpackers can travel for months, if not years, with a backpack in the 40-46-litre range! It's easy to fit in a week's worth of clothes, as well as all your travel essentials.

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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.

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