A medium-sized backpack would be ideal for those thinking about an overnight trip. If you pack light, a pack of 40 or 50 liters would also be enough to store your clothes, tent and sleeping bag during a 3-day hike. That said, 50L should be enough for a 3-day trip in early summer, especially when sharing equipment. I personally use a 45L pack for almost my entire backpack, but it can be adjusted to pack alone.
The very large bags, 65 litres or more, are suitable for long hiking trips. These bags work well outdoors when you'll be carrying clothes and camping gear for several days. Suitcases larger than 65 litres are too big to travel, even on long trips. If you are traveling for more than a week or two, you will have to do your laundry.
Maybe you have an extended camping trip on the horizon. You may need to upgrade your travel backpack for upcoming international trips. A 30 L — 50 L backpack will be just what you need. You can store all your sleeping, cooking and camping equipment you need for trips of up to 5 or 6 days.
A lightweight packer will have ample room for five nights or more with a multi-day backpack, which is typically a 50-liter backpack or more. They are designed to carry more food and cooking fuel than a weekend pack, as well as extra clothing and layers. The specific packages for expeditions or winter camps will be on the larger side (more than 75 liters) to accommodate a warmer sleep setup, mountaineering equipment and first aid and survival equipment. Look for a super burly suspension, as well as wide straps and loops to attach the gear or carry the backpack itself.
A note about measuring capacity, you will sometimes see hiking backpack sizes expressed in cubic inches, and sometimes in liters. It is possible to buy a large capacity backpack even if you are small and need a small frame backpack. This is because backpacks may not have rectangular shapes (they are usually curved to fit their body and be more comfortable) and it allows people to understand how much their backpack can hold when planning an extended trip or trip around the world. When it comes to traveling for the first time, other than buying a plane ticket, I think there's nothing that says you're really “doing it” other than going to the store and buying your backpack.
As you may have noticed, boys and girls have sticky parts in different places, and good backpacks are designed with that fact in mind. Or, perhaps, you prefer to research on your own and come prepared, ready to buy the perfect backpack size for you. Unlike normal luggage, camping and travel backpacks are measured by their load capacity, not by their dimensions. Good quality backpacks can be expensive and it's always tempting to try to save money whenever possible to spend it on important things like beer.
Now that you know well what to look for in a hiking backpack and hopefully have a general idea of how to pack a hiking backpack, you are ready to determine the size, capacity and style of the backpack that best suits your needs. Often, backpacking to a camping spot and posting for a few days is a good time with a large package, as you can carry any amount of kitchen items, drinks and extra clothing; the walk gets even sweeter without the weight of all the food you managed to eat. If you are not looking for a backpack for a specific trip, but a backpack that you will use for all your trips and for everyday use, a 70 l backpack is too much. For example, the backpack I lived on for six months in Puerto Rico and Central America is very similar to the “Osprey Aura 50L.
All the ones I have encountered seem to be too heavy, very uncomfortable and, in general, impractical for everyday use, whether as a backpack or suitcase. .