There is a very simple and easy way to determine the capacity of a backpack in liters. To do this, measure the linear dimensions - the height, width and depth of the backpack, then multiply these three values.
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Large Bearing Capacity: (Maximum)50L. Size: 14.2 x 9.4 x 23.6 inches.
Normal backpacks or daily backpacks have volumes where you can easily fit small items that may be needed at work or school during the day. Their volumes vary between 15 liters and 30 liters.
A 50L+ backpack is a great friend to those travelling for a few weeks. These bags are spacious and can accommodate a number of outfit changes before you ever have to visit a laundromat. But don't be tempted to fill your pack to its capacity before you've even left - remember to save space for souvenirs!
A 40-litre backpack is big enough for travelling. A 40-litre backpack is a great size for travellers because it can be taken as hand luggage on most flights while still fitting enough gear for a long weekend, two-week vacation or even months of backpacking!
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.)