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.
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A weekend backpack like a standard 40L backpack is big enough to carry a backpacking sleeping bag, small tent, and pad, as well as extra clothing and layers. Other things you'll need to carry include a small stove, food and basic cookware, plus a water filter/purifier, first aid kit, and navigation tools.
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.
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.
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.
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.
In most cases, the compartment size may range from about 35 to 45 liters. In some cases, the bag may also have an expandable pull string storage for more space.
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.
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.
It is going to be on your back carried through train stations, city streets, and airports. It is important to have a pack that is big enough to carry everything, but not too big to be a major burden. I recommend getting a backpacking style pack that is between 30-45L.
If you buy a 55 liter to 65 liter back from a backpack manufacturer than only counts their closed storage in their volume spec, there's a pretty good chance you can carry all of your backpacking essentials inside your backpack, including a bulkier synthetic insulated sleeping bag and a two-person tent.