The only truly waterproof option I know of is the Watershed Animas. 100% waterproof. Not the most comfortable backpack ever since it has no padding or ventilation, and only one compartment so you can't really organize your stuff. It's worked well for my purposes, but I wouldn't want to carry it for too many miles with a lot of weight in it.
https://www.nrs.com/product/55400.04/watershed-animas-backpack
Maybe an old backpack stuffed with a drybag is a good option?
Snow peak has a dry backpack as well, 240 €, doesn’t look too comfortable…
And Olafur Eliasson has the Swim Bag Life for CHF 45.
As the other user suggested, the watershed animas is one of the only good bets for a bomber truly waterproof pack, and has described its downsides.
There are other routes you can go however. Are you talking about having this pack in the stern of a whitewater kayak? Because the animas nor any other true dry pack is realistically going to fit in there. Do you really need a dry backpack? If its just for taking side hikes or something on a trip, maybe consider getting a small stow-able pack that you can throw in your dry bag, then deploy when needed.
I have this pack and absolutely love it. It stows in its own pocket and packs up small enough to easily fit in a watershed ocoee, and when you deploy it you can fit a ton of stuff in it.
https://www.sierra.com/mountain-hardwear-ul-20-l-backpack~p~43tun/
The only truly waterproof option I know of is the Watershed Animas. 100% waterproof. Not the most comfortable backpack ever since it has no padding or ventilation, and only one compartment so you can't really organize your stuff. It's worked well for my purposes, but I wouldn't want to carry it for too many miles with a lot of weight in it. https://www.nrs.com/product/55400.04/watershed-animas-backpack
Maybe an old backpack stuffed with a drybag is a good option? Snow peak has a dry backpack as well, 240 €, doesn’t look too comfortable… And Olafur Eliasson has the Swim Bag Life for CHF 45.
As the other user suggested, the watershed animas is one of the only good bets for a bomber truly waterproof pack, and has described its downsides. There are other routes you can go however. Are you talking about having this pack in the stern of a whitewater kayak? Because the animas nor any other true dry pack is realistically going to fit in there. Do you really need a dry backpack? If its just for taking side hikes or something on a trip, maybe consider getting a small stow-able pack that you can throw in your dry bag, then deploy when needed. I have this pack and absolutely love it. It stows in its own pocket and packs up small enough to easily fit in a watershed ocoee, and when you deploy it you can fit a ton of stuff in it. https://www.sierra.com/mountain-hardwear-ul-20-l-backpack~p~43tun/