When I can afford it I'm going to spring for a waterproof Ortlieb bag like my wife has. Mind you they ain't perfect, for some reason Ortlieb provide this lock feature that's as much use as a chocolate teapot.
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And I know for sure there are "alternative routes" that parallel I-5 here (Old 99, for one), yet you can still legally ride the shoulder of I-5 if you wantLet no one run away with the idea that the alternative is easy. I did manage to get from Kelso to Camas without going on I5 by attempting to follow old 99. It involved a very hard climb and a lot of time. Some gent who lives in Kelso sent me a PM saying I couldn't have chosen a worse route, I should have gone down I5.
The issue is riding on an interstate with its wide shoulders, with two lanes giving trucks a lane to pass and of course with no oncoming traffic must be safer.