Generally, small backpacks or mini backpacks have a capacity of 5L to 15L.
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As a general rule of thumb, anything smaller than the dimensions of a carry-on can be considered a personal item. However, every airline has different restrictions for size. In most cases, your backpack should be no more than 18 x 14 x 8 inches.
Most bags range from about 30L (1,800 cubic inches) all the way to 100L+ (6,000+ cubic inches). I recommend a backpack around 40L-50L. Personally, I wouldn't go over 65L, but some people like a bigger bag.
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.
Backpack capacity is almost always measured in liters - a universally accepted standard unit - which makes it much easier to compare backpack sizes across brands. 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.
If there is too much space between your shoulders and the shoulder straps, or if the anchor point of the shoulder straps is to high or low even though the hip belt is in the right position, the backpack may be the wrong size or the torso length needs to be adjusted.
Above all else, the best backpack for you is the one that fits your body the best. One of the keys to finding that right backpack is to get one that is the correct size (e.g., small, medium, large). Your torso length—not your height—is the key measurement.
Let's face it, most European airlines are pretty, pretty stingy when it comes to their carry on size restrictions. That's why we designed our Carry-on bag and Daily bag to comply with nearly all European carriers – as well as more generous American ones.
International carry-on sizes are generally smaller than the US domestic limit of 22 x 14 x 9 inches or 45 linear inches. Carry ons for international flights are usually between 22 and 15.7 inches tall, with varying depth and width limits.
Stay at least two weeksAlthough longer backpacking trips through Europe seem more expensive than shorter trips, there are a number of advantages to long trips, and it's quite feasible to spend 1-2 weeks in Europe without breaking the budget.