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.
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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.
?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!
Anything around the 40-45 litre mark should still be carry-on compliant depending on the dimensions and the airline. They make for great travel bags when you don't want to check in luggage. Even if you're a heavy packer, you should be able to take a 45L pack away for a weekend.
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.
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.
Weekend (1-3 nights; 30-50 liters)Efficient packers using newer, less-bulky gear can really keep things light on 1- to 3-night t rips by using a pack in this range.
Pack Weight for Backpacking and HikingA loaded backpacking pack should not weigh more than about 20 percent of your body weight. (If you weigh 150 pounds, your pack should not exceed 30 pounds for backpacking.) A loaded day hiking pack should not weigh more than about 10 percent of your body weight.
Among our daypacks, most of the bags below 40 liters will meet carry-on requirements. Follow the 22” x 14” x 9” or 45 linear inch total for standard carry-on dimensions, or call your airline for specific guidelines.
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.
Size and Weight RestrictionsTypically, the bag must be within the cabin baggage dimensions of around 22 x 14 x 9 inches (56 x 36 x 22 cm), commonly considered the standard size for carry-on. Any bag within this dimension can fit most aeroplanes' overhead compartments.
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.