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.
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Generally, most of the European airlines limit carry-on luggage to a maximum size of 55 x 40 x 20 cm ( 21.6 x 15.7 x 7.8 in); however, a few airlines do accept bags up to 25 cm wide (9.84 inc) or do not accept more than 35cm tall (13.7 in).
Assuming you're taking a plane, the best-size backpack for traveling Europe will meet carry-on standards. The maximum carry-on size for European backpacks (in liters) is generally around 40-45L. But 35L is a good size to ensure you slide under the limits.
LARGE BACKPACKS (> 40L)Anything around the 40-45 litre mark should still be carry-on compliant depending on the dimensions and the airline. They make for great travel bags when you don't want to check in luggage. Even if you're a heavy packer, you should be able to take a 45L pack away for a weekend.
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.)
A 30L – 50L backpack will be just the ticket. It will be able to hold all your sleeping, cooking, and camping gear you need for trips up to 5 or 6 days.
Is 65L backpack too big for Europe? 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.
Volume: A 45L backpack is the maximum-sized carry on allowed on most US airlines. For international or budget airlines, choose a bag under 40L. If you want to pack ultralight, anything 35L or under can be carried on virtually any airline. Dimensions: The common 45L volume is usually measured as 22 x 14 x 9 inches.
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.
In general, spaces are a lot smaller, the infrastructure isn't very suitcase friendly and if you're backpacking, you'll probably be flying with a lot of low-cost airlines or taking the train or a bus. All this is what makes travel backpacks the ideal packing method for a European vacation.
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.
Your backpack will generally be allowed as a carry-on if it's under 50 liters, or about 22 x 14 x 9 inches. Get a 45-liter backpack if you want to carry as much stuff as possible on the plane with you.
With plenty of space to pack bulky clothes, we think the Nomatic Travel Bag 40L would make an excellent carry-on backpack for any and all types of trips since it can be carried multiple different ways—which also makes it an ideal convertible bag.
50 liters is considered as the sweet spot for backpacking trips up to 2-3 days. 65 liters is sufficient up to a 5-6 days, or almost a week if you tend to pack very little.
With 10,000 USD, you could easily travel around Europe for a few weeks. You could stay in budget hostels and eat at local restaurants or cook your own meals. If you plan carefully and look for deals, it's possible to stretch that amount even further.
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.
For a 2-month trip through SEA, I'd personally recommend a 40L backpack. It's a good balance between carry-on size and having enough space for all your stuff. Plus, it's versatile enough to use for day hikes as well as leaving at hostels/hotels.