Is a 40L backpack big enough for backpacking reddit?
It is the perfect size for travel, just don't pack it full. A 40L backpack half empty weighs essentially the same as a 20L backpack stuffed full. I did 4 months abroad with a GORUCK GR2 34L a few years ago.
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40-50 Liters (The Ultralight Thru-Hiker)Expect to fit everything you could fit in a smaller pack, plus: A food bag that can hold up to 5-6 days worth of food. A pot for cooking. A camp stove and fuel.
A 40 liter backpack is the best size for traveling in Europe as it's small enough to fly carry-on only. If you aren't up to the challenge of travelling with a 40 liter pack, you just need to make sure that you choose a backpack you will be comfortable carrying for long periods of time.
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.
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.
For a multi-day, or weekend hike, a 45L to 55L backpack offers enough volume for the average backpacker. The extra capacity allows for carrying more food, water, fuel, and some comfort items you might leave behind for a single night trip.
Choosing a BackpackYou should aim for a size between 40 and 60 litres and definitely no larger. While it may seem that bigger is better, remember that you'll need to carry it on your back, sometimes for an hour or more, in an extremely hot and humid climate.
Note that an Allpa 28L will fit in an overhead bin even if it's stuffed to the gills, but the 35L and 42L are where things get a bit murkier. While the 35L will fit in most (but not all) overhead bins, the 42L generally cannot be fully packed out and still fit in an overhead bin.
A 40L backpack is your perfect weekend companion. With clever storage, you'll have plenty of room for a sleeping bag, solo tent, camping mat, food, and extra clothing and layers to keep you comfy. You can take 40-45L backpacks as carry-on for flights.
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.
In most cases, backpacks are considered personal items as long as they fit under the seat in front of you. For example, if you use a backpack as a personal item and put it under the seat in front of you, you can then use a duffel as a carry-on bag as long as it's under the airline's size requirements.
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.