Whether it's marine sports, kayaking, jet skiing, fishing, or river rafting, accidents involving wet smartphones and wallets are constant concerns during waterside activities. A waterproof bag is your most reliable companion in such situations. However, because waterproof bags come in a variety of capacities, materials, performance levels, and uses, many people find it difficult to choose the right one. This article organizes the basic ways to select a waterproof bag by capacity and usage, providing a clear guide to help you make the right purchase without any regrets.
Understanding Waterproof Bag Performance
Waterproof bags are broadly divided into two categories: "completely waterproof" and "water-repellent/water-resistant." For marine sports or environments exposed to heavy splashing, choosing a completely waterproof type that uses a roll-top closure or meets IPX standards is essential.
- IPX4–5: Resists splashing from all directions. Suitable for everyday rain or light water sports.
- IPX6–7: Withstands strong water jets or temporary submersion. Suitable for jet skiing or whitewater kayaking.
- IPX8: Allows continuous use at depths of over 1 meter. Often used for diving and underwater photography.
Since waterproof depths and testing conditions vary by manufacturer and product, always check the specifications before purchasing. Additionally, note that IPX ratings are evaluations based on testing conditions and may vary depending on actual usage.
How to Choose by Capacity | Selecting the Right Size for Your Activity
The capacity you need depends heavily on what you are carrying and the type of activity. Use the following as a guide:
Up to 5L: For small items like smartphones, wallets, and keys
Small waterproof pouches or dry bags under 5L are ideal for carrying essentials while on a jet ski or SUP (Stand-Up Paddleboard). They fit snugly against the body to avoid getting in the way, specializing in protecting necessities like smartphones, credit cards, and keys. Waterproof waist pouches are also popular.
5–15L: The standard size for day trips
A 10L dry bag is a balanced choice for daily water activities such as kayaking, snorkeling, or rafting. It can hold a change of clothes, a towel, energy snacks, and a power bank, and it is easy to attach to a boat or kayak.
20–40L: For overnight touring and camping
For multi-day sea kayaking tours or boat camping, a large-capacity waterproof bag of 20L or more is necessary. It can store bulky items like tents, sleeping bags, and clothing, and roll-top designs allow for flexible capacity adjustment. However, as the bag gets larger, it gets heavier, so consider the balance between volume and portability.
Recommended Bag Types by Usage
Jet Skiing / PWC
Jet skiing involves constant exposure to heavy splashing at high speeds. A completely waterproof dry bag or a waterproof waist pouch is mandatory. For safety, choose a bag designed to be stored in under-seat compartments or secured to your body. A 3–10L capacity is generally most practical.
SUP / Kayaking
Because there is a risk of capsizing during SUP or kayaking, always select a completely waterproof type so that your belongings remain safe if submerged. It is common to secure a deck bag or roll-top dry bag to the deck loops.
Fishing / Beach / Leisure
For fishing or beach use, water-repellent or water-resistant performance may be sufficient in some cases. However, if you are bringing a smartphone or electronic devices, it is safer to make it a habit to put them in a separate waterproof pouch.
General Marine Sports
For sports where you might be pulled underwater, such as wakeboarding or tow-tubing, an IPX7 or higher waterproof bag is recommended. If you wear the bag, choose a compact design that does not hinder your movement.
Key Points to Check When Choosing a Waterproof Bag
- Closure Mechanism: Roll-top styles ensure reliable waterproofing, while zipper styles require you to verify if they feature an IPX-rated waterproof zipper.
- Material Durability: PVC (polyvinyl chloride) is highly waterproof and durable but heavier. TPU is lighter and more flexible.
- Carrying Style: Choose from backpack, waist pouch, or dry bag styles based on your activity.
- Color and Design: Bright colors are a practical choice for increased visibility on the water.
- Buoyancy: Whether the bag itself floats is a critical factor in case it is washed away.
Tips for Long-Lasting Waterproof Bags
Always rinse your waterproof bag with fresh water after use and let it dry completely before storing it. Rinsing is particularly important after seawater exposure, as salt can degrade the material and zippers. Since the seal on a roll-top can gradually weaken with use, periodically check its waterproof integrity. For long-term storage, keep the bag in a well-ventilated area away from direct sunlight.
Frequently Asked Questions (FAQ)
Q1. Can water still get in even if it says "completely waterproof"?
Yes. IPX ratings are based on performance under test conditions; water can still seep in due to prolonged submersion, punctures, degradation over time, or improper roll-top closure. It is recommended to double-protect valuables.
Q2. How many times should I roll the top?
Generally, it is recommended to roll the top at least three times before securing it. However, if the manufacturer specifies a number of folds, follow those instructions. Expelling excess air before rolling helps increase the waterproof seal.
Q3. Is it safe to put my smartphone directly into the waterproof bag?
While completely waterproof types are generally safe, using an additional waterproof smartphone case is recommended to further reduce the risk of damage.
Q4. How should I secure the bag while SUPing or kayaking?
Common methods include using carabiners or specialized straps to attach the bag to the deck bungee cords or deck loops of the kayak or board. Always make it a habit to secure the bag to the vessel to prevent it from floating away if you capsize.
Q5. Are there waterproof bags for children?
Yes, small, lightweight waterproof pouches and bags designed for children are available. It is best to choose one with a simple closure system that is easy for a child to operate.
Summary
The key to choosing a waterproof bag is to consider four factors: waterproof performance, capacity, usage, and closure mechanism, based on your planned activities. For serious water sports like jet skiing and SUP, a completely waterproof type is necessary, while for lighter activities like beach visits or fishing, you can choose based on your specific needs. Having the right waterproof bag significantly expands your range of activities and provides peace of mind at the water's edge.
You can find essential waterside gear—including waterproof bags, life jackets, wetsuits, and marine accessories—at the JSP TOKAI Online Store. We carry a curated selection of products chosen by staff who are experts in marine sports, so be sure to check it out.