How to choose the right sized backpack ? 

The size of a backpack, which is measured by its volume, is an essential criterion that you must consider when buying one. A backpack whose size is not suited to your use will be neither useful nor practical. If the backpack is too small, it will be uncomfortable to wear and will require you to do without some of the equipment you intended to carry, and if the backpack is too big, it will be too cumbersome. 

Therefore, carefully choosing the right size will guarantee comfort and safety, and will avoid having to carry several bags, which is not very practical when travelling.

The size of your backpack depends on several criteria. Amongst these criteria, the main reason why you will use the backpack is important. The ideal size for your backpack is not the same for daily use, long hikes or long trips.

For daily use You prefer to carry your belongings in a backpack, because it is more convenient on public transport. In this case, two sizes of backpack could be right for you. In a 10-litre backpack, you can carry a book, a Thermos flask or a bottle of water, an e-book reader, a notebook, etc. This volume can contain small objects and accessories. On the other hand, if you want to carry a laptop computer, then you should opt for a 20 to 25-litre backpack. This capacity may also be suited to carrying your picnic, your drinks and your sun cream on walks lasting a few hours.

- Long hikes or two-day treks If you are planning a one-day hike or a weekend trek, then the volume of your backpack must be at least 30 litres, but only if you have accommodation on the spot and you do not have to carry any camping equipment. If there are more than two of you and you intend to carry everyone's gear, especially for the children, then a 40-litre backpack will be more suitable.
For an expedition lasting several days or a long trip Are you planning to go camping for several days or spending your nights in a bivvy or refuge? In this case, your backpack must be large enough to contain you day and night time clothing, your duvet and the basic equipment for eating and drinking. The 50 and 60-litre models are ideally suited to this situation. These sizes are also suitable for backpackers who are planning a long trip in many stages.

While activity and use may be similar criteria, it is worth noting some slight differences between the two. The type of equipment you carry significantly impacts the size of the backpack you need.

To carry basic equipment If you want to use your backpack to carry some clothes and a few accessories on a weekend expedition, then a 40 or 50-litre model is large enough. You should also consider who is wearing the backpack. Will you be the only one carrying everything, or will you share this job with another person? In the latter case, a 30 or 40-litre backpack for each person is amply sufficient.

Carrying bedding equipment If you are taking your bedding equipment (duvet, mattress) with you on your expedition, then you will need a 50-litre, or even 60-litre, backpack. This will be large enough to carry all the belongings you need, as well as your equipment, provided it is sufficiently compact. If this is not the case, don't panic. Most hiking or trekking backpacks have accessories that can be used to fasten your equipment on the outside.

Carrying a complete set of camping equipment You are setting off on an adventure with all the equipment you need for camping or bivouacking. A gas stove, gas canisters and various utensils... In this case, a 70 or 80-litre backpack is right for you. These volumes are ideal for adventurers who want to be independent and to manage every aspect of their expeditions themselves.

It is not easy to carry a full backpack without hurting your back or shoulders. Therefore, it is important to only carry articles that are really necessary, and to adopt a few good habits.

- Adjust the straps, belt and lashes
Adapt your posture
Take regular breaks, if you carry the backpack for several hours
Carefully distribute and store your belongings in the backpack

It is necessary to learn how to choose your backpack in order to wear it in comfort and safety. You need to know exactly which equipment you will be carrying. Therefore, you are advised to plan and prepare your purchase carefully. Do not hesitate to try out the models in the store. This is the best way of finding out whether the backpack is right for you or not. Finally, you can supplement your backpack with different accessories. By carefully studying and adapting your equipment, you will really make the most of your outdoor activities, such as hiking and trekking.