How Can I Waterproof My Backpack?

How Can I Waterproof My Backpack? Purchase a truly waterproof backpack. Start with a high-quality water-repellent backpack. Improve water resistance with Spray-On Water Repellent and Seam Sealers. Protect your pack from the outside with a Backpack Rain Cover. Put Your Backpack into a Dry Sacks. Can I make a canvas bag waterproof? One of the