Backpacks are somewhat uncommon when it comes to usage. There are mainly two reasons I can think about.
Firstly, packing and depending on the backpack’s size, there is an undoubtedly chance that many of your belongings might not fit into your bag. A backpack might fit your water bottle, clothing, gadgets but would not necessarily fit your portable tv or any larger products you have. Even with a decent size backpack, packing your clothes would still be a drag if you’re packing for a week of vacation.
The second reason to think of is unpacking your belongings. The thing about the backpack is that there is one way in and not another way out. There’s always a 1 point exit, whichever it goes. Imagine that you just went for a very exhausting hike, and you’re probably thirsty beyond belief. You are opening your backpack and knowing that to get to the bottle, you’ll need to unpack every of your stuff to get to that bottle is just another exhausting session you have to go through.