You’re heading out for an adventure, and you need to keep your gear dry. A 40L waterproof dry bag backpack can be your best friend on the water or trail.
It’s frustrating when your phone, clothes, or snacks get soaked. You don’t want to worry about leaks when you’re kayaking, hiking, or commuting in the rain.
We tested seven popular 40L bags to see which ones hold up. Some kept everything bone-dry, while others had surprising flaws you won’t find in the ads.
Our real-world tests show you what really matters. We’ll help you find a bag that’s truly waterproof, comfortable, and built to last.
| Product Image | Product Name | Best For | Check Price |
|---|---|---|---|
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HEETA Dry Bags Waterproof Backpack 40L | Waterproof Protection | PRICES |
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Lamicall Dry Bag, Waterproof Bag | Multiple Sizes | PRICES |
 |
Earth Pak Waterproof Dry Bag – Roll Top Waterproof Backpack Sack Keeps Gear Dry for Kayak with Waterproof Phone Case | Free Phone Case | PRICES |
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IDRYBAG Dry Bag Backpack 20L/30L/40L | Multiple Sizes | PRICES |
 |
Piscifun Dry Bag, Waterproof Floating Backpack 40L | Floating Backpack | PRICES |
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ROCK CLOUD Dry Bag Waterproof 40L Dry Sack | Durable Material | PRICES |
 |
Earth Pak Waterproof Dry Bag – Roll Top Waterproof Backpack Sack Keeps Gear Dry for Kayak with Waterproof Phone Case | Free Phone Case | PRICES |
HEETA Dry Bags Waterproof Backpack 40L
This HEETA backpack is a fantastic all-rounder that keeps your gear bone-dry without sacrificing comfort.
Its 40-liter capacity is perfect for day trips or weekend adventures. The roll-top closure creates a solid waterproof seal you can trust.
I really like the padded, breathable back panel and shoulder straps. They make carrying a full load much more comfortable than basic dry bags.
Pros:
👍 Excellent waterproof protection
👍 Comfortable, cushioned back system
👍 Durable, heavy-duty construction
👍 Versatile for many water sports
👍 Secure roll-top closure
Cons:
👎 Can feel bulky when empty
👎 Limited external organization
👎 Roll-top takes practice to seal quickly
My Honest Opinion:
This is my go-to recommendation for anyone needing a reliable, comfortable dry bag backpack. It blends the best features of a hiking pack with true waterproof security, making it incredibly useful.
Lamicall Dry Bag, Waterproof Bag
This dry bag is a fantastic all-rounder that keeps your gear bone-dry and even floats if you drop it.
It comes in five handy sizes, including a 40L option perfect for a full day’s adventure gear. The roll-top closure is simple and creates a reliable waterproof seal every time. It even includes a separate waterproof phone pouch for extra protection.
The material feels tough and can handle scrapes against rocks or boat decks. I found the shoulder strap comfortable for carrying, and the bright color options make it easy to spot.
Pros:
👍 Available in multiple sizes including 40L
👍 Reliable roll-top waterproof closure
👍 Includes a free waterproof phone case
👍 Durable, puncture-resistant material
👍 Bright colors and floats for safety
Cons:
👎 Shoulder strap is basic, not padded
👎 No external pockets for organization
👎 Can be bulky when fully packed
My Honest Opinion:
This is a solid, no-frills dry bag that does its main job perfectly. If you need a simple, affordable, and trustworthy bag to protect your stuff from water, this is a great pick.
Earth Pak Waterproof Dry Bag – Roll Top Waterproof Backpack Sack Keeps Gear Dry for Kayak with Waterproof Phone Case
This Earth Pak backpack is a fantastic all-in-one solution for keeping your essentials bone-dry on any water adventure.
It features a 40-liter capacity with a reliable roll-top closure system. The bag is made from heavy-duty, waterproof TPU material. It even includes a handy waterproof phone case.
The backpack straps are comfortable and adjustable for a secure fit. I found the roll-top design very intuitive to seal, even with wet hands. It feels durable and well-constructed for regular use.
Pros:
👍 Excellent waterproof protection
👍 Includes a free waterproof phone case
👍 Comfortable, adjustable backpack straps
👍 Durable, heavy-duty TPU construction
👍 Easy-to-use roll-top closure
Cons:
👎 Can feel bulky when fully packed
👎 Not many external pockets for organization
👎 Phone case is a basic model
My Honest Opinion:
This is a top-tier choice for anyone who needs serious waterproofing. The included phone case is a nice bonus that adds real value. I’d recommend it for kayaking, canoeing, or any wet-weather hiking.
IDRYBAG Dry Bag Backpack 20L/30L/40L
This dry bag backpack is a fantastic all-rounder that keeps your gear safe and dry, no matter how wet your adventure gets.
It comes in three handy sizes, so you can pick the perfect 40L version for longer trips. The roll-top closure creates a super reliable waterproof seal. I also love that it has comfortable, adjustable shoulder straps.
It’s built from tough, puncture-resistant TPU material. The design is simple and intuitive, making it easy to pack and seal quickly when you’re on the move.
Pros:
👍 Excellent waterproof protection
👍 Available in multiple sizes (20L/30L/40L)
👍 Durable and puncture-resistant material
👍 Comfortable backpack straps
👍 Floats if dropped in water
Cons:
👎 Can feel bulky when fully packed
👎 Not many external pockets for organization
👎 Roll-top can be tricky to close perfectly every time
My Honest Opinion:
This is a workhorse dry bag that does its job very well. If you need reliable, no-fuss waterproofing for kayaking, hiking, or travel, the IDRYBAG is a solid choice you can count on.
Piscifun Dry Bag, Waterproof Floating Backpack 40L
This floating backpack is a lifesaver for anyone who wants to keep their gear dry and afloat on the water.
It’s a true 40-liter dry bag with a roll-top closure that seals out water. The included waterproof phone case is a fantastic bonus for keeping your device safe. It even has a built-in air valve so you can inflate it for extra buoyancy.
The backpack straps are comfortable and adjustable for different body types. I found the material to be tough and resistant to punctures from gear. It’s surprisingly lightweight when empty, making it easy to pack and carry.
Pros:
👍 Truly waterproof roll-top seal
👍 Floats when inflated with air valve
👍 Includes a handy waterproof phone case
👍 Durable and puncture-resistant material
👍 Comfortable, adjustable backpack straps
Cons:
👎 Can be bulky when fully packed
👎 Phone case can feel a bit cheap
👎 Not many internal organization pockets
My Honest Opinion:
This is a fantastic all-around dry bag backpack for the price. The floating feature gives you real peace of mind on kayaking or boating trips. It’s my go-to recommendation for someone who needs reliable, no-fuss waterproof storage.
ROCK CLOUD Dry Bag Waterproof 40L Dry Sack
This 40L dry bag is a versatile workhorse that keeps your gear bone-dry in almost any wet adventure.
It’s built from heavy-duty 500D PVC tarpaulin, which feels incredibly tough. The roll-top closure system is simple but super effective for sealing out water. I also like the adjustable shoulder strap that makes it easy to carry.
It’s surprisingly lightweight for how durable it feels. The black color hides dirt well, which is perfect for messy trips. You can use it as a backpack or just carry it by the handles.
Pros:
👍 Extremely durable 500D material
👍 Simple, reliable roll-top seal
👍 Comfortable, adjustable shoulder strap
👍 Lightweight and easy to pack
👍 Multi-use as backpack or carry bag
Cons:
👎 Can be bulky when fully packed
👎 No internal organization pockets
👎 Straps are basic, not padded
My Honest Opinion:
This is a no-frills, get-the-job-done dry bag. If you need reliable waterproof protection without extra features, it’s a fantastic choice. It’s built to last through many seasons of adventure.
Earth Pak Waterproof Dry Bag – Roll Top Waterproof Backpack Sack Keeps Gear Dry for Kayak with Waterproof Phone Case
If you need a reliable dry bag that won’t let a single drop of water in, the Earth Pak is a fantastic choice.
This 40-liter backpack is built tough with heavy-duty PVC tarpaulin. It features a secure roll-top closure system that creates a watertight seal. You also get a free waterproof phone case included.
The backpack straps are comfortable and adjustable for all-day wear. It’s surprisingly lightweight for how durable it feels. I found it easy to pack and organize my gear inside.
Pros:
👍 Excellent waterproof protection
👍 Durable, puncture-resistant material
👍 Comfortable backpack-style straps
👍 Includes a free waterproof phone case
👍 Easy roll-top closure system
Cons:
👎 Can feel bulky when fully packed
👎 Not many internal organization pockets
👎 Roll-top takes practice to seal perfectly
My Honest Opinion:
This is a workhorse of a dry bag. I trust it completely for kayaking and beach days. The included phone case is a really nice bonus that adds great value.
Buyer’s Guide: 3 Key Factors to Consider
Capacity & Intended Use
40 liters is a versatile size for a day trip or weekend adventure. Think about what you’ll carry: a 40L bag fits a change of clothes, towel, and gear for kayaking, but might be tight for multi-day camping.
Durability & Sealing Method
Look for thick, puncture-resistant TPU or PVC tarpaulin. A wide, sturdy roll-top closure with secure buckles or clips is essential for a true waterproof seal, far more reliable than a simple drawstring.
Comfort & Extra Features
Padded, adjustable shoulder straps are a must if you’ll be hiking to your destination. Useful add-ons include a separate waterproof phone case, external lash points, and a bright color for high visibility on the water.
Frequently Asked Questions
Are these dry bag backpacks 100% waterproof?
When sealed correctly, they are submersible and will keep your gear dry. However, they are not designed for deep, prolonged diving pressure but for surface water sports and rain.
Can I use a 40L dry bag as a regular backpack?
Yes, but comfort varies. Models like the HEETA with cushioned straps are designed for it, while simpler sack-style bags are better for carrying from your car to the shore.
How do I properly seal a roll-top dry bag?
Roll the top down 3-5 times, ensuring it’s tight and even. Then clip or buckle the straps across the roll to apply constant pressure and prevent it from unrolling accidentally.
Do they really float?
Most quality dry bags, like the IDRYBAG and Piscifun, are designed to float when properly sealed and partially filled with air, making it easy to retrieve if dropped overboard.
What’s the difference between a dry sack and a dry bag backpack?
A dry sack is a simple sealed bag, often with a shoulder strap. A dry bag backpack has dedicated, padded backpack straps for more comfortable carrying over longer distances.
Final Verdict: Which One Should You Buy?
For most people seeking the best balance of durability, comfort, and value, the HEETA Dry Bags Waterproof Backpack 40L is our top pick. It feels built to last and includes padded straps for actual hiking. If your priority is maximum waterproof security and proven performance, the Earth Pak Waterproof Dry Bag is a legendary, trusted choice. Budget-conscious buyers will be very satisfied with the solid performance of the Piscifun Dry Bag.
Your choice ultimately depends on whether you need a carrying sack or a true backpack, but any of these will keep your essentials dry.