Most backpacks are designed in a way to keep hikers stable on unleveled ground. They have a body-hugging internal frame that transfers all the load to the hips. For carrying heavy and irregular loads, they have external-frame backpacks available. These packs provide better ventilation and many options for arranging your equipment. Furthermore, frameless backpacks are accessible for those hikers who prefer quick hikes and want a lighter pack.
Nowadays, backpacks include a mesh back panel to prevent your back from being sweaty. Ventilation chimneys are built into the back panels to increase airflow. Thus, a backpack that has the ventilation feature is best for warm areas.
Considering your gear, you need to look for a backpack with enough pockets to accommodate all your stuff. Elastic side pockets are for water bottles, tent poles, and other loose objects. Hip belt pockets are designed for those items that you need to reach instantly like phones and snacks. Other types of pockets include shovel pockets and front pockets.
Choosing according to the backpack fit
Backpacks are available in many sizes, from extra small to large, fitting a range of lengths varying by the manufacturer and gender. Some packs may also have an adjustable suspension to modify the length. If you plan on going on more demanding adventures, I would recommend you take a look at tactical backpacks. They are known for their endurance and are often used in the military.
Your hips should support most of the weight of your backpack. Backpacks come in a variety of hip sizes, ranging from 20 to 40 inches. Some packs also provide compatible hip belts to swap out one size for another.
Keeping in mind all these types of backpacks, choose one for yourself very carefully according to your schedule and make your trip more enjoyable.
Some helpful resources:
Outdoor Gear Lab