Why Is There a Gap Between My Back and Backpack?

https://mountainsforeverybody.com/why-is-there-a-gap-between-my-back-and-backpack
Hiking and backpacking backpacks are quite generally built by following these two basic concepts:

There is a tensioned mesh that is in contact with your back, while the backpack is actually detached from your back.
The backpack is close to the body, and its back panel is in contact with your back.
Both concepts have their pros and cons.

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