Whether navigating a class IV rapid, trekking through a Pacific Northwest downpour, or keeping your gear scent-free for a hunt, the difference between a successful trip and a miserable one often comes down to your bag. Not all "waterproof" gear is created equal—some are designed to survive a quick splash, while others can be dragged behind a boat.
In this guide, we’ll break down exactly what to look for when purchasing a waterproof duffel or backpack, using RUGID Gear as our benchmark.
1. Material & Fabric: PVC vs. TPU
The "skin" of your bag is your first line of defense. Most high-end waterproof gear is made from one of two materials:
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PVC (Polyvinyl Chloride): Extremely durable and cost-effective. RUGID’s 500D PVC duffels and cases are known for being incredibly tough and tear-resistant, making them ideal for heavy-duty hauling where the bag might get "kicked around in the boat." Duffels, cases and packs made with PVC typically fall at a more affordable price, making them more attractive. The downside is PVC is less flexible than TPU material and slightly less durable.
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TPU (Thermoplastic Polyurethane): TPU is the material of choice in RUGID’s premium lines, like the 600D TPU used in their 35L Airtight Backpack. TPU is generally more flexible in any temperature and more environmentally friendly than PVC. TPU has a generally softer feel and is more durable overall.
What to look for: Check the "Denier" (D) rating. A higher number (like 500D or 600D) indicates a thicker, more abrasion-resistant fabric. Attachment points on RUGID bags are even higher, 800D, 1000D and sometimes even as heavy as 1200D. Learn more on denier.
2. IP and IPX Ratings: Decoding the Letters and Numbers
When browsing for gear, you’ll often see a code like IP67 or IPX7. This is the "Ingress Protection" or “IP” rating. A standardized scale that tells you exactly how much water the bag can handle.
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IPX4: Protected against splashing water from any angle. Good for light rain.
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IPX6: Protected against powerful water jets. This will survive a heavy storm or being sprayed with a hose, but shouldn't be held underwater.
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IPX7 (The "Gold Standard"): This means the bag can be fully submerged in 1 meter of water for a period in some cases of up to 30 minutes.
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The "X" vs. a Number: If you see IP67, the "6" means the bag is also 100% dust-tight. If you see IPX7 (like on many RUGID duffels), the "X" simply means it hasn't been officially tested for dust, though many waterproof bags, including RUGID’s are naturally dust-proof by design.
RUGID Example: Most of RUGID’s submersible collection maintains an IPX7 rating, ensuring that your gear stays bone-dry even if the bag goes overboard. More on IP ratings.
3. The Great Closure Debate: Zipper vs. Rolltop
How a bag closes determines its level of "waterproofness."
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The Airtight Zipper: If you need 100% submersion protection, look for a "SCUBA-style" zipper. Products like the RGD Fully Submersible Duffel use these airtight zippers.
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Pros: Allows for a wider opening and easier access to gear; can be made airtight/scent-tight.
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Cons: Requires occasional maintenance (lubrication) to keep the pull smooth.
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The zippers are stiffer by design of the airtight build and tolerances.
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The Rolltop: This is the "old school" foolproof method. By rolling the fabric down three or more times and clipping it, you create a mechanical seal. The Rugid Roll Top Bug Out Backpack is a prime example.
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Pros: No moving parts to break; expandable/adjustable volume.
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Cons: No "quick" access—you have to unroll the top every time you want something from the bottom.
4. Warranty: Is the Brand Standing Behind the Gear?
Outdoor gear lives a hard life. Straps snag, zippers are stressed, and bags are tossed into truck beds and boat bottoms. A major differentiator for a brand is its warranty.
RUGID offers a Limited Lifetime Warranty on their core line of PVC and TPU bags. This is crucial. When you're buying professional-grade gear, you aren't just buying a bag; you're buying the assurance that if a seam fails or a defect appears, the company has your back.
5. Advanced Features: The "Extras" That Matter
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Bleeder/Purge Valves: Found on many RGD duffels, these allow you to squeeze out excess air to save space or add air to ensure the bag floats.
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Convertible Carry Systems: A good duffel should have padded straps that allow it to be worn as a backpack, shoulder bag or carried.
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Welded Seams: High-quality bags use RF (Radio Frequency) welding to fuse the fabric together, creating a bond stronger than the material itself—far superior to traditional stitching for water protection.