So, what size backpack do you need? You initially need to decide on what kind of hikes you might be going on. Outdoor backpacks are measured in either cubic inches or liters. Liters are quickly replacing the cubic inches as the measurement of choice.
Day Hikes: Day Bags up to 33 liters or 2,000 cubic inches (unique packs, like climbing backpacks can be larger).
Multiday (2 to 4 days): 57 plus liters, 3500 plus cubic inches.
Week Hikes (5 to 7 days): 70 liters, 4300 plus cubic inches.
Extended Length Hikes (8 days or longer): 80 liters, 4,800 plus cubic inches.
This is a basic guideline. If you are trekking in colder months, then a more substantial pack might be necessary to keep bulkier clothing and equipment. A male's backpack will usually be bigger when compared with a ladies'. When you are the head or are carrying "group" equipment or perhaps a child's gear, then a more substantial backpack will be necessary.
Outdoor Backpack Measurement - The Fitting Room:
Now that you know what size pack you, require, get one that fits you. Packs are sized with respect to body length. In order to measure your torso length, have an individual go to the bottom of the neck and find the top vertebrae or bone sticking out. It will be sticking out further than the others and ought to be right below the neck. That is where you are going to spot the end of a tape measure. Then put your hands on your hips and find the top of the hip bones. Just as before these should be the portion that sticks out the most. Put your hands in such a manner so your thumbs are on your lower back and aiming towards each other. Then your friend is going to take the tape measure along your back and make a line from one thumb to the other. The distance from your top vertebrae to that line is your torso size.
Extra Small: Lesser than 16"
Small: 16" to 18"
Medium: 18" to 20"
Large: More than 20"
Some backpacks do not come in various sizes, but the straps and support framework are changeable to several body lengths.
Generally backpack belts include a huge array of changes for waist size, but it helps to find out your size before you search for backpacks. A number of backpacks even include multiple belt choices, so if the one that's on the backpack is too big or small, it could be removed and an appropriate sized belt put on.