I've waxed canvas before, with iron and blowdryer to melt it in. The resulting canvas is considerably darkened and to the touch feels, oddly enough, very waxy.

On the aerosol side, I've had good luck with Atsko Silicone Water Guard on lighter materials (windbreakers, tents) although I think an annual re-spray would be necessary for that. Upside is it doesn't change the appearance or feel of the cloth being treated.

Nice lookin' bags you found there