20 to 29 liters: Best for students and 15- to 16-inch laptops. 30 to 39 liters: For super-size workloads and weekend trips. 50 to 80 liters: For hikers and campers.
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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.)
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.
Multiday Packs: 50-75 litersA 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.
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.
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.
One MIGHT get away with a 55L backpack, but 40L would be much more reliable. Carry-on limits are defined by total linear inches, typically 45 or fewer, also maximum dimensions particularly length, generally 22 inches. 22 x 13 x 9 is 2574 cu. inches, 42L.
Lightweight backpack for outdoor, Ultralight, only 2.1 pounds for 60L large capacity,reducing the backpack loading weight so that you can carry more other items. The maximum loading bearing is 33lb.
Multiday (3-5 nights; 50-80 liters)These are the most popular backpacking packs sold at REI and they're an excellent choice for warm-weather trips lasting 3 or more days.
Regular backpackers have packs that weigh about 30 lbs. They're generally newcomers to the hiking hobby, and they have a tendency to overpack. If you're a newcomer going backpacking for the first time, it's a good idea to never exceed 40 lbs and go with an experienced friend or a group of hikers.
No matter how well-designed the backpack, less weight is always better. Use the bathroom scale to check that a pack isn't over 10% to 20% of your body weight (for example, if you weigh 120 pounds you shouldn't carry a backpack that weighs more than 12 to 24 pounds).
No matter how well-designed the backpack, less weight is always better. Use the bathroom scale to check that a pack isn't over 10% to 20% of your body weight (for example, if you weigh 120 pounds you shouldn't carry a backpack that weighs more than 12 to 24 pounds).
Size and Weight RestrictionsTypically, 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.
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.
In many cases, as long as it's not larger than about 55L, yes, you can use many backpacking backpacks as a carry on. Or, if you want to check extra gear like tent stakes and trekking poles, check it all.
I recommend a backpack around 40L-50L. Personally, I wouldn't go over 65L, but some people like a bigger bag. You can always go smaller, but I wouldn't recommend anything smaller than 35L — unless you're into minimalist travel.