Waterproof Your Pack with a Rain Cover and Spray
By Sleeping Bags, Tents, Pads & Outdoor Gear | Published: 2026-10-19
Category: How-to Guides
Learn how to keep your backpack and gear dry on the trail using a pack rain cover and waterproofing spray. Step-by-step advice for effective gear waterproofing.
Quick answer
Use a pack rain cover as your first line of defense and a waterproofing spray like Nikwax to treat fabric and seams for long-lasting moisture protection.
Why a rain cover alone isn't enough
A pack rain cover blocks rain from hitting your backpack directly, but moisture can still seep through zippers, seams, and the pack fabric itself during prolonged wet weather. That's why combining a cover with a spray-on waterproofing treatment gives you more reliable protection. The cover handles the heavy rain, while the spray reinforces the pack's own water resistance.
Another trade-off: a rain cover adds a few ounces to your load and can snag on branches. If you're trying to save weight, a spray treatment alone might suffice for light showers, but for sustained downpours, the cover is your best bet.
How to waterproof your pack in 4 steps
- Clean your pack thoroughly: Remove all dirt and debris from your backpack using a mild soap and water. Pay special attention to seams and high-wear areas. Let it dry completely before moving to the next step. Dirt blocks waterproofing sprays from bonding to the fabric, so a clean pack is essential.
- Apply a waterproofing spray to the fabric and seams: Hold the spray nozzle 6–8 inches from the pack and apply an even coat over the entire outer surface, focusing on seams and zipper flaps. Follow the product's recommended drying time before use. Work in a well-ventilated area and avoid oversaturating any one spot to prevent sticky residue.
- Fit your pack rain cover correctly: Choose a cover that matches your pack's volume (e.g., 40L or 60L). Slip it over the top of your pack and pull the drawcord snug around the bottom. Ensure the cover covers the main compartment and any side pockets. A loose cover can flap in the wind and let water in at the bottom. Tighten the cord so it stays put.
- Reapply treatment after heavy use or washing: Over time, abrasion and dirt will reduce the spray's effectiveness. After several trips or if you wash your pack, reapply the waterproofing spray to restore protection. Check the fabric's water repellency by sprinkling a few drops on the surface. If they soak in instead of beading up, it's time to retreat.
Products that help
- HyperBead™ Pack Rain Cover: The HyperBead™ Pack Rain Cover uses proprietary ultralight HyperBead™ fabric that sheds water while keeping weight and packed size minimal. You get reliable rain protection without adding noticeable bulk or weight to your pack.
HyperBead™ Pack Rain Cover - Nikwax Spray On Tent & Gear SolarWash: Nikwax Tent & Gear SolarWash is a spray-on cleaner and UV protector that extends the life of synthetic and canvas equipment by up to 50%. It both cleans and protects your pack's fabric, helping maintain water repellency and UV resistance over time.
