Choosing a backpack requires careful consideration: it needs to be just the right size to fit everything we need, while not being so heavy that it gets in the way when walking, exercising or taking part in another activity. Backpack size is usually given as its capacity in litres, while the exact width and height are rarely specified. These dimensions matter when travelling by plane and wanting to take a backpack as hand luggage, which must not exceed certain limits. In that case, we’ll have to take a tape measure with us when shopping.
