Can I swim in water with a waterproof bag?

Yes - you can swim with a waterproof bag if it meets the right technical criteria. A true swimming-grade waterproof bag should carry an IPX7 or IPX8 rating , be constructed from materials capable of withstanding prolonged submersion, and be sealed using a proven closure method such as a roll-top or triple-lock system. Not every bag labeled "waterproof" is engineered for swimming; many are designed for rain or splash protection only. When properly selected and used, a waterproof bag for swimming can protect valuables such as a phone, keys, or clothing while also providing buoyancy for added safety.

 

 

 

Types of Waterproof Bags and How They Work

Standard Waterproof Bags (Dry Bags, Backpacks, Pouches)

Traditional waterproof dry bags and waterproof backpacks are common among kayakers, hikers, and beachgoers. They are usually constructed from vinyl-coated nylon, TPU, or high-density PVC, with seams welded or taped to prevent seepage. A roll-top closure, when rolled three or more times and buckled, creates a mechanical and airtight seal that resists water intrusion. These bags are excellent for keeping gear dry in rain, splashes, or brief immersion - for example, when dropped in a river or when kayaking. However, they may not be optimized for continuous towing through the water during swimming.

Swimming-Specific Waterproof Bags

A waterproof bag for swimming differs in both structure and function. Many feature inflatable air chambers that allow the bag to float alongside the swimmer. This buoyancy is critical in open-water environments, where a floating waterproof bag also doubles as a safety aid. Some models, like a swim buoy bag, attach to the swimmer's waist via a tether, keeping it close without impeding arm strokes. High-visibility colors - bright orange, yellow, or pink - and reflective accents improve safety by making swimmers visible to boats. Certain designs integrate a waterproof pouch or waterproof phone case for swimming inside the main compartment, enabling you to operate your phone without exposing it to water.

 

 

Understanding IPX Waterproof Ratings

Waterproof performance is measured by the International Electrotechnical Commission's IPX rating system, which classifies resistance to water ingress. For swimming applications, the following ratings are most relevant:

• IPX4–IPX6: Protects against splashes or high-pressure jets. Adequate for rain or deck spray but not for immersion.
• IPX7: Withstands immersion up to 1 meter for 30 minutes - suitable for short swimming sessions if properly sealed.
• IPX8: Custom-tested for submersion beyond 1 meter, with depth and time specified by the manufacturer. An IPX8 waterproof bag is the preferred choice for extended swimming, snorkeling, or shallow diving.

Achieving IPX7 or IPX8 status requires more than water-resistant fabric. It demands materials impervious to liquid water, seamless or welded construction, and closure systems that remain secure under water pressure. A water-resistant vs waterproof bag comparison illustrates this: water-resistant models may survive rain but will leak when submerged, while true waterproof designs are engineered for immersion.

 

Can You Swim with a Waterproof Bag? Five Key Factors for Feasibility

Swimming with a waterproof bag is entirely possible - but its success hinges on several design and usage considerations:

1.Waterproof Rating and Certification

Choose a bag with at least an IPX7 rating for brief immersion or IPX8 for prolonged swimming. Verify that the bag has been tested for depth and duration relevant to your activity, whether that's casual beach swimming or snorkeling.

2.Seal Integrity

The closure system is the primary defense against leaks. Roll-top closures should be rolled a minimum of three times before fastening; zipper or triple-seal pouches must be fully engaged with no fabric caught in the seal. Any compromise in the seal's alignment will nullify the waterproof rating.

3.Buoyancy and Air Volume

For swimming, leave some air inside the bag to enhance flotation. A floating waterproof bag not only helps keep valuables above water level but also serves as an emergency rest aid during open-water swims.

4.Load Weight and Balance

Overpacking a bag reduces buoyancy and increases drag. Essentials - such as a phone, keys, ID, or a compact towel - should be prioritized. Heavy loads may also place undue stress on the sealing system, increasing the risk of leaks.

5.Ergonomics and Towing Comfort

Bags designed for swimming often use waist tethers or slim-profile straps to reduce drag. Wide, padded backpack straps, like those on some waterproof backpacks, are more suitable for walking to the beach than for active swimming. Testing the towing comfort in calm water before a long swim is essential.

 

Safety Guidelines for Swimming with a Waterproof Bag

Proper technique and preparation are just as important as the bag's construction. Even the best waterproof bag for swimming can fail if used carelessly. Here's how to maximize protection and safety:

Pre-Swim Preparation

• Test Before You Trust

Before your first open-water swim, perform a controlled trial. Place tissue paper inside, seal the bag according to the manufacturer's instructions, and submerge it in a pool or bathtub for several minutes. If the tissue comes out dry, the sealing system is performing correctly.

• Double-Bag Electronics and Valuables

For items like smartphones, car keys, or cameras, use a secondary layer of protection - such as a waterproof phone case for swimming or a small internal dry pouch - before placing them inside the main compartment. This creates redundancy in case of unexpected seal failure.

• Check for Damage

Inspect seams, valves, and closures for wear. Micro-abrasions in PVC or TPU layers can develop into leaks under water pressure. If any part of the closure system feels loose or degraded, replace the bag or have it repaired.

 

During the Swim

Maintain Flotation

• Leave adequate air inside the bag to ensure it stays afloat. This buoyancy can provide short-term rest support, particularly in open water.
• Secure the Bag to Your Body

Use a waist tether or adjustable strap to keep the bag within arm's reach. This prevents drifting and reduces the risk of losing it in currents or waves.

• Avoid Overloading

Heavy loads create drag, slow your pace, and can pull the bag underwater. Prioritize essentials; leave non-critical items on shore or in a locker.

• Be Aware of Environmental Hazards

Sharp rocks, coral, or barnacle-covered docks can puncture even a premium IPX8 waterproof bag. Steer clear of these hazards, especially when entering or exiting the water.

 

Common Misconceptions About Waterproof Bags

1. Water-Resistant Equals Waterproof

One of the most frequent misunderstandings is confusing water-resistant vs waterproof bag. Water-resistant bags, often rated around IPX4–IPX5, can repel splashes and light rain but are not suitable for submersion. True waterproof bags - particularly those rated IPX7 or IPX8 - are engineered to withstand full immersion without leakage.

2. Waterproof Means Unlimited Submersion

Even a certified IPX8 waterproof bag is tested under specific depth and time conditions. Prolonged exposure beyond those limits, especially under high pressure, can eventually allow water ingress.

3. Moisture-Proof Protects Against Liquid Water

Moisture-proof designs defend against humidity and condensation, not direct liquid exposure. While excellent for long-term storage in damp environments, they are unsuitable for swimming.

4. Any Dry Bag Can Be Used for Swimming

Standard waterproof dry bags for kayaking are designed to handle splashes and occasional dunking, but without buoyancy features, towing straps, or high-visibility colors, they may not be safe for active swimming.

 

Introducing our 100% water resistance backpack

 

Waterproof Swimming Survival Backpack

This Waterproof Swimming Survival Backpack is made of IPX8-rated 420D TPU material with 100% water resistance. The 20-liter capacity can accommodate laptops and other electronics. In addition, this waterproof backpack for swimming can also act as an inflatable survival tool if necessary. Perfect for outdoor adventure sports.

• Excellent Water Resistance

Constructed from 420D TPU with an IPX8 rating, airtight zippers, and heat-sealed joints, this backpack is tested for 100% protection at depths up to 30 m. It keeps contents dry in rain, splashes, or during beach, river, and other water activities.

• Multi-Functional Safety Design

Features a built-in inflatable mouthpiece for independent inflation, serving as auxiliary lifesaving equipment and even acting as a back airbag to protect the waist in case of a fall.

• Ergonomic Comfort

An EVA-molded back panel, ergonomic shoulder straps, and adjustable chest and waist straps ensure stability, comfort, and reduced fatigue during activities like running or climbing.

• Spacious & Customizable

20 L capacity with laptop and accessory compartments meets outdoor needs, and options range from 10 L to 40 L in multiple colors and sizes.

 

Inflatable Sup Backpack

 

 

Our Inflatable SUP Backpack is designed specifically for outdoor sports enthusiasts. Made from high-quality TPU and waterproof nylon materials, this backpack offers military-grade waterproof performance and exceptional durability. Additionally, it features an inflatable airbag that can serve as an auxiliary life-saving device in certain situations, enhancing safety during outdoor activities. It is particularly well-suited for SUP, mountaineering, and other adventurous sports.

• Exceptional Waterproofing

Made from 840D waterproof TPU with a sealed zipper, this backpack meets military-grade standards and has passed 30 m deep-water testing.

• Versatile Inflatable Airbag

An external valve inflates the internal airbag for use as a life ring, back protection during falls, or SUP support.

• Lightweight & Ergonomic

Weighing 0.75 kg, it features ergonomic straps and a padded mesh back panel for comfort and reduced shoulder strain.

• Spacious & Organized

The 16 L capacity includes internal nylon pockets, external mesh side pockets, and a front compartment for easy organization during travel or SUP sports.

 

Conclusion

In summary, you can go swimming or engage in other water activities with a waterproof bag on your back. However, before entering the water, you need to check whether the waterproof rating of your bag meets the requirements, as well as the water activity you are going to undertake and the corresponding waterproof performance requirements. Generally, the waterproof bag needs to reach the IPX8 waterproof level and be equipped with other waterproof designs, such as waterproof materials, sealed zipper weld technology, etc. If you are looking for a high-quality waterproof bag supplier, please email us. ( kathy@flwaaa.com )