Waterproof Your Backpack: Simple Steps for Dry Gear

Quick answer

• Use dry bags inside your pack. It’s the easiest way.
• Pack smart: heavy stuff low, rain gear accessible.
• Consider a pack cover. They’re cheap and work well.
• Treat your pack fabric. It helps shed water.
• Know your route. Avoid flash flood areas.
• Check the forecast. Always.
• Pack it in, pack it out. Leave No Trace is key.

What to check first (do this before you drive out)

Before you even think about packing, get a handle on the conditions. This isn’t just about comfort; it’s about safety.

Land manager / legality

Who’s in charge out there? Is it the US Forest Service, BLM, a National Park, or a state park? Each has its own set of rules. Know where you can camp, where fires are allowed, and any permit requirements. Ignorance isn’t a good defense when a ranger rolls up.

Access/road conditions

Can your rig actually get there? Some forest roads turn into mud pits after rain. Check recent reports if you can. If you’re in a 2WD sedan, maybe that remote trailhead isn’t the move after a big storm. High-clearance 4WD is a different story, but even then, know your limits.

Fire restrictions + weather + wind

This is a big one. Fire bans are common, and for good reason. Always check the current restrictions for the area. Beyond fires, look at the weather forecast. Not just rain, but temperature drops and wind. High winds can make a trip miserable and dangerous.

Water plan + waste plan (Leave No Trace)

How are you getting water? Are there reliable sources, or do you need to carry it all? Plan for filtration or purification. And remember, pack it in, pack it out. This includes all trash, food scraps, and anything else you bring. Burying toilet paper is okay in some areas, but check local LNT guidelines.

Safety (wildlife, distance to help, comms)

What critters are in the area? Bears, snakes, mountain lions – know what you might encounter and how to be safe. Also, how far are you from a road or help? Cell service is usually a fantasy in the backcountry. Tell someone your plans and when you expect to be back. A satellite messenger is a good investment for remote trips.

Step-by-step (field workflow)

Here’s how to get your pack ready for whatever the sky throws at you.

1. Assess the Forecast:

• What to do: Check the weather for your specific destination, not just the nearest town. Look for rain, snow, wind, and temperature.
• What “good” looks like: You have a clear picture of potential weather events and can plan your gear accordingly.
• Common mistake: Only glancing at the general forecast. This can lead to being caught off guard by localized storms or temperature drops. Avoid this by digging a little deeper.

2. Gather Waterproofing Gear:

• What to do: Collect your dry bags, pack cover, and any waterproof stuff sacks.
• What “good” looks like: All your protective layers are clean, dry, and ready to go.
• Common mistake: Assuming your old dry bags still seal. Check zippers and seams before you need them.

3. Line Your Pack:

• What to do: Place a large, heavy-duty trash compactor bag or a dedicated pack liner at the bottom of your main compartment.
• What “good” looks like: The liner fits snugly and covers the entire interior of the pack.
• Common mistake: Using a thin trash bag that can easily rip. Opt for the thickest compactor bags you can find or a purpose-built liner.

4. Pack Essentials in Dry Bags:

• What to do: Put your sleeping bag, extra clothes, and electronics into appropriately sized dry bags.
• What “good” looks like: Each critical item is sealed in its own waterproof container.
• Common mistake: Overstuffing dry bags. This makes them hard to seal and can stress the material. Leave a little room.

5. Organize Dry Bags within the Pack:

• What to do: Place your dry bags inside your pack, with heavier items closer to your back and lower down. Keep rain gear and snacks easily accessible.
• What “good” looks like: Your pack is balanced and you can grab what you need without unpacking everything.
• Common mistake: Stuffing dry bags randomly. This leads to a disorganized pack and makes finding things a chore. Think about weight distribution.

6. Treat Your Pack Fabric (Optional):

• What to do: Apply a DWR (Durable Water Repellent) spray to the exterior of your backpack.
• What “good” looks like: Water beads up and rolls off the fabric.
• Common mistake: Not cleaning the pack before applying the treatment. Dirt and grime prevent the DWR from bonding properly.

7. Deploy Pack Cover:

• What to do: If rain is likely, put on your pack cover. Make sure it fits snugly and covers the entire pack.
• What “good” looks like: The cover is secure and doesn’t flap around, providing a solid barrier against rain.
• Common mistake: Forgetting to use it until you’re already soaked. Put it on before the rain starts.

8. Secure All External Pockets:

• What to do: Zip up and secure any external pockets, even if they aren’t waterproof.
• What “good” looks like: All openings are closed, minimizing water entry points.
• Common mistake: Leaving mesh pockets or lid compartments open. Even a light rain can get a surprising amount of water in.

9. Check for Gaps:

• What to do: Do a final visual check to ensure there are no obvious gaps where water could seep in, especially around straps and the top lid.
• What “good” looks like: Everything looks sealed and secure.
• Common mistake: Assuming the pack is waterproof just because you used a cover and dry bags. Small gaps can still let in moisture.

10. Know Your Limits:

• What to do: Understand that even with precautions, a full submersion or prolonged downpour can eventually soak through.
• What “good” looks like: You have realistic expectations and a plan for drying gear if it gets wet.
• Common mistake: Relying solely on waterproofing without considering contingency plans for wet gear.

Common mistakes (and what happens if you ignore them)

Mistake	What it causes	Fix
Not checking the weather	Soaked gear, hypothermia, ruined trip.	Always check the forecast for your specific location before leaving.
Using flimsy trash bags	Tears, water leaks, wet sleeping bag and clothes.	Use heavy-duty compactor bags or dedicated pack liners.
Overstuffing dry bags	Difficulty sealing, potential seam stress, water ingress.	Leave some air space when rolling the top to ensure a good seal.
Packing critical items outside dry bags	Wet clothes, cold nights, unusable electronics.	Anything essential for warmth or safety goes in a dry bag, no exceptions.
Forgetting to treat pack fabric	Fabric absorbs water, adding weight and reducing breathability.	Reapply DWR treatment annually or when water stops beading.
Not using a pack cover in rain	Pack fabric gets saturated, adding significant weight.	Deploy the pack cover as soon as rain is imminent.
Leaving external pockets open	Small items in pockets get wet, potential for water to seep into main compartment.	Zip up and secure all external pockets, even if they’re not meant to be waterproof.
Ignoring road conditions	Getting stuck, vehicle damage, wasted time, potential rescue situation.	Check local reports or call the ranger station for current road status.
Not telling anyone your plans	If something goes wrong, no one knows where to look for you.	Leave a detailed itinerary with a trusted contact.
Assuming your gear is invincible	Overconfidence leads to poor preparation and unexpected problems.	Always have a backup plan for wet gear and know your gear’s limitations.

Decision rules (simple if/then)

• If the forecast calls for more than a 30% chance of rain, then use dry bags for all clothing and sleeping gear because a little moisture can make a big difference in comfort and safety.
• If you’re going on a multi-day trip, then pack a spare set of dry clothes in a dedicated dry bag because having dry layers is crucial for overnight warmth.
• If the trail is known for flash floods, then avoid camping in dry washes or low-lying areas because water can rise rapidly and without warning.
• If you’re using a pack cover, then ensure it’s properly secured with all drawstrings tightened because a loose cover can blow off or let rain in.
• If your pack fabric is old and looks worn, then consider reapplying a DWR treatment because it helps shed light moisture and keeps the pack lighter.
• If you have electronics like a phone or GPS, then they absolutely must go in a waterproof case or dry bag because water damage is usually permanent.
• If you’re hiking in an area with unpredictable weather, then keep your rain jacket and pants easily accessible at the top of your pack because you might need them fast.
• If you see signs of water damage inside your pack after a trip, then inspect your dry bags and pack liner for holes or worn seams because something failed.
• If you’re backpacking in winter, then consider a larger pack cover or even a waterproof pack liner because snow melt and wet conditions are a bigger concern.
• If you’re unsure about water sources, then pack enough water for the whole trip or bring a reliable filtration/purification system because dehydration is a quick trip-ender.

FAQ

How do I make my backpack completely waterproof?

True “waterproof” is tough for fabric packs. The best approach is to use waterproof dry bags inside your pack for all essential gear, combined with a good pack cover.

Can I just use a garbage bag?

A heavy-duty compactor bag can work as a liner in a pinch. But they can tear more easily than dedicated pack liners or dry bags. It’s a budget option, but not ideal for serious backcountry trips.

What’s the difference between water-resistant and waterproof?

Water-resistant means it can handle light rain or splashes for a short time. Waterproof means it’s designed to prevent water from entering, even under pressure or prolonged exposure. Most pack fabrics are water-resistant.

How often should I reapply DWR treatment?

You should reapply DWR when water stops beading up and starts soaking into the fabric. This usually happens once a year with regular use, but can be more or less frequent depending on conditions.

What happens if my sleeping bag gets wet?

A wet sleeping bag loses its insulating properties and can lead to hypothermia, especially in cold weather. It also takes a very long time to dry. This is why keeping it dry is paramount.

Is a pack cover really necessary?

If there’s any chance of rain, yes. Pack covers are relatively inexpensive and add a significant layer of protection. They also help keep your pack from getting weighed down by absorbed water.

How do I pack my tent to keep it dry?

Most tent footprints and rainflies are water-resistant, but it’s still smart to pack them in a separate dry bag or at least at the top of your pack. If it’s raining when you set up camp, you don’t want a soaking wet tent to deal with.

What about my boots? Do I need to waterproof them?

Yes, especially leather boots. Use a good waterproofing wax or spray designed for footwear. This helps keep your feet dry and prevents the boots from getting heavy and waterlogged.

What this page does NOT cover (and where to go next)

• Detailed gear reviews for specific waterproof pack models.
• In-depth analysis of different DWR treatment brands.
• Advanced backcountry navigation techniques for severe weather.
• Specific campsite recommendations for rainy conditions.
• How to repair tears in waterproof fabrics.