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Mine.
Pic related.
I got the same model of old German army-backpack. This is an excellent daypack but can also be used for longer trips.
It is one of the most durable backpacks you can get. I bought mine second-hand about 10 years ago and had it on a lot of trips.
It is still in perfect condition.
But be careful, you buy an original used German army backpack and not some low-quality replica shit made in China.