I have used it as a daypack for a trip to Asia, he is very good water-repellent, a tropical rain he holds would nonetheless not stand (I know of nothing that a tropical rain withstands xD)
he has high loads gewichtliche temperature fluctuations, humidity, storms survived, easy to wash, and costs relatively backpacks to other very little.
it's a backpack as it should be, should I go sometime broken, I'm going to buy this again :)
Conclusion: 5 stars
greeting
Patrick
