50-75 liters: For a trip that lasts one to two weeks, many people jump up to a bag in this range.
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50-75 liters: For a trip that lasts one to two weeks, many people jump up to a bag in this range. 75 liters-100+ liters: For big expeditions, travelers typically need several large bags that can hold 75 liters or more each. (Keep in mind, of course, that the larger the bag, the heavier it is to haul.
A 40-litre backpack is a great size for travellers because it can be taken as hand luggage on most flights while still fitting enough gear for a long weekend, two-week vacation or even months of backpacking!
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.
2-3 Day Packs: 35-50 litersA 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.
The truth is that if you're looking for a versatile backpack for travelling Europe, South East Asia or even South America, a 40L backpack will (probably) be the perfect size.
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.
Large suitcases: 2 to 3-week tripLarge suitcases have a height of around 75cm. These suitcases are ideal for a 2 to 3-week trip, like to the French Riviera.
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.
Multiday Packs: 50-75 litersA light packer will have ample room for five nights or more with a multiday backpack, which is typically a 50L backpack or larger. These are designed to carry more food and cooking fuel than a weekend pack, as well as extra clothes and layers.
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.
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.
Multiday (3-5 nights; 50-80 liters)Packs in the 50- to 80-liter range are also great for shorter trips where you pack a little more luxuriously or multisport activities like backcountry skiing.