Understanding Backpack SizesAs 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.
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Backpack size: 18×13.2×11.6; Capacity: 42L. With its large size and multiple pockets, this bag is ideal for storing your clothes, first aid kit, water bottles, food for 3 days and other survival tools.
40 liters is definitely big enough for traveling, as long as you're not an over-packer. It's a good idea not to go for an overly large backpack - overpacking can be as troublesome as under-packing.
The 40L dimensions are 21 x 14 x 10.5 (53 x 35 x 27 cm). The depth is a little over max on many airlines which tends to be about 9”. But this bag has no frame, so the actual packed dimensions is largely determined by what you put in the bag. And if you don't pack it too full it will work fine as a carry on.
No, it will be too big (assuming it's full or has a rigid frame, like most packs that size do). The biggest backpacks that will usually fit in an overhead compartment are 40L or so.
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.
Is 45 liters too big for a day hiking pack? Yes, 45 liters is more space than most people will need in a day hiking pack. The sweet spot for day packs is more like 15 – 30 liters, which is enough space for a day's worth of food and water, warm layers or rain gear, safety essentials, and other small items.
A 40L backpack sits in the sweet spot between lightweight daysacks and heavy-duty 80L rucksacks. They're extremely flexible – working for average day hikes and overnight wilderness camping. They also give you the extra room needed for climbing gear or winter hikes.
?FLIGHT APPROVED CARRY ON BACKPACK? This 48L luggage backpack is measured as 22 x 14 x 7.5 inches which meets the carry-on baggage allowances for most IATA flights overhead compartment.
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!
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.
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.
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.)
I use a 40L pack and it is good for up to 5 days. A 48L should cover you for a week. If you have used your pack for 4-5 day hikes, then it will definitely work! Thru-hiking is not this mysterious thing that requires more gear.