Waterproof Cycling Ruck sack / Rucksack / Back pack / Backpack / Backpacks

Anybody have experience cycling with one of these? How's the build quality? I don't carry huge amounts but it will be used daily and don't want threading coming out within a month! They have just released the liberty x herschel and think it's time to invest in a new backpack as my 8 year old vans backpack just isn't cutting it anymore.

Cheers all, tried finding a generic backpack / bag thread but couldn't find one.

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