How big of a backpack do I need for a 2 week trip?
Extended-trip (5+ nights; 70 liters or larger)Trips of 5 days or more usually call for packs of 70 liters or more.
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Is 65 Litre backpack big enough for 2 weeks? For most people and most hiking routes, yes, a 65 liter pack is big enough for backpacking. It's perfect for a long weekend even if your gear list isn't exactly lightweight. With a thoughtful lightweight backpacking setup it's big enough for a week without resupply.
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.
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.
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.
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.
Is 45L backpack enough for 3 weeks? 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.
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!
Large Backpacks: 40+ LitersLarge 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.
The most popular size check-in luggage is 25- to 29-inches tall and various widths. Medium-sized check-in luggage measures 25-26” tall and around 18” wide. * One medium-sized suitcase will generally hold what you need for a week-long getaway.
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.
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.
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.
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.