How to choose a backpack for a summer hike?

Are you going to go to the woods and mountains for a weekend or even longer in the summer? In that case, you definitely cannot do without a proper backpack. How to choose it?
Choosing a backpack according to its purpose
The first thing you need to consider when choosing a backpack is its purpose. Do you need a backpack for the city, in which you can put water, a snack for yourself and the children and a few other essentials? Or you choose a backpack for nature, even for…