Still there's def ways to build them durably, look at the Cilo W/NWD packs. Yeah, they're fucking expensive, but I think that's because of the custom woven face. The same designs that use XPac (mixed with other fabrics that aren't waterproof, unfortunately, I think) are way cheaper.
I know Arc'Teryx built some full waterproof backpacking bags in the past, and IIUC their AC^2 fabrics are waterproof lamiantes. A few of their commuter bags are made entirely from them, I think a few alpine type bags are too (though not seam sealed, apparently), and their current Boras mix the AC^2 stuff with not waterproof fabrics.