Recommendations for backpacks?

I'm looking for a new backpack that is heavy-duty and will last for a while. It should fit a 15.7 inch laptop. Does anyone have any recommendations?

https://www.dakine-shop.de/Rucksaecke/
there are also cheaper at Amazon.

Have you ever looked at army shops for discarded or even new goods that are basically made of very robust material? But it is also sewn so "openly" that, if necessary, it can be easily repaired with thread and needle.

I recommend military-grade backpacks that are built to last.

https://www.raeer.com/shopdisplaycategories.asp?oid=1023