Their capacity lets you carry an extra layer, food and gear for day trips. 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.
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Many airlines: 35-40L, but check the measurements of the backpack because one 40L backpack isn't the same as another brand. For LCC the capacity could be lower. 30L may be good enough. Again, check the dimensions before purchasing.
A 30 litre backpack, is also suitable for weekend trips as they will easily accommodate spare clothing, water, food and other essentials. However, if you have to take sleeping bags and other camping gear, it's likely you'll need a larger backpack.
A 30 litre backpack is plenty, but can be a little bit small for versatility. * You need 3 changes of clothes, so that you can wash a new item each day, and have at least 2 days for it to dry.
Expedition Edition (Ultra-Light Thru-Hike, Weekend Trip, or International Travel) ? 30-50 liters. Perhaps you have an extended camping trip on the horizon. Maybe you need to upgrade your travel backpack for those upcoming international trips. A 30L – 50L backpack will be just the ticket.
Backpack capacity is almost always measured in liters - a universally accepted standard unit - which makes it much easier to compare backpack sizes across brands. As 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.
24-26 liters is considered a medium-size backpack and is probably the most popular bag capacity out there. It's great for taking to school or work, depending on the styling, and can also be a great travel pack for taking on a plane. Here is a potential packing list for that size depending on where you're headed.
The usual maximum dimensions for carry-on luggage are 9 inches x 14 inches x 22 inches (22 centimeters x 35 centimeters x 56 centimeters). This is 43.12L, so your 50L backpack is about 16% too big.
MEDIUM BACKPACKS (20 – 35L)This capacity range is considered a medium-size backpack and is probably the most popular bag capacity out there. It's great for taking to school or work, depending on the styling, and can also be a great travel pack for taking on a plane.
This means it's something you could happily take on a weekend away if you're a light packer, or as a day bag if you need to take a lot of stuff. Another good size for plane travel as well, without any concern with carry-on compliance. Here's a packing list for what you can fit in a 32-34 liter backpack.
With plenty of space to pack bulky clothes, we think the Nomatic Travel Bag 40L would make an excellent carry-on backpack for any and all types of trips since it can be carried multiple different ways—which also makes it an ideal convertible bag.