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Waterproof Backpack 20L

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Regular price Regular price: $79.00 Sale price Regular price:

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Waterproof Backpack 20L
Our team of fellow paddlers designed this 20L waterproof backpack to carry and protect your belongings from getting wet when doing water sports.

This 20L backpack lets you carry your belongings and protect them from splashes of water and brief immersion. Ideal for kayaking, stand-up paddling or light sailing.

A photo of the Waterproof Backpack 20L in use


Resistant to splashes, spray and brief immersion.


20L usable capacity to hold small belongings and spare clothes

Carrying comfort

Ergonomic, adjustable, thick foam-padded shoulder straps.


PU coated & TPU laminated polyester material.


1 inner A4 pocket and a small zipped pocket for a wallet.


Easy to attach to an SUP or a kayak thanks to its attachment straps.


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Product Reviews

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23 Reviews
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Good value

I have used the bag for 3-4 kayaking sessions. The many clips are helpful which I use to secure the bag to kayak. Contents in bag remained dry even when kayak is capsized. Size is good for a day or overnight trip and the internal pockets with zip help separate my wallet/keys from other bigger items like food

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Hi Jeremy!

Thank you for taking the time to review our products. We are pleased to hear you enjoy using this WATERPROOF BACKPACK 20L - GREY.

Yes indeed, this product is designed to let you carry your belongings and protect them from splashes of water and brief immersion. Ideal for kayaking, stand-up paddling or light sailing.

We, in Decathlon, always strive to make sports available to everyone and we hope you are amongst those that have benefitted from this objective. We hope to see you in our stores again! :)

Best Regards,


Sports Advisor


Beautiful and functional bag at a very affordable price.

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Hello Say Tun,

Thank you for the review about our product: WATERPROOF BACKPACK 20L - GREY

We, in Decathlon, always strive to make sports available to everyone via our products at affordable prices, and we hope you are amongst those that have benefitted from this objective. We hope to see you in our stores again! :)

Best Regards,


Sports Leader

Good bag and definitely waterproof

I love this bag, it’s stylish and it does it’s job. The only thing I’d change is adding a few compartments. Once your stuff is inside it takes a while to get things out. I’m using it for general use on rainy days.

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Perfect Backpack

Very nice backpack with complete waterproof feature.

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Overall good bag

This bag is great to keep stuff safe but it could be a little bit more practical. There is no way to adjust the clasp to close the bag. Meaning that if you have an article a little bit bigger you will not be able to close the bag.

Good bag needs improvement though

The attachments to do up the bag are not adjustable so really hard to close up quickly on the water. Also the chest strap is not women friendly boobs get in the way. However, the actual bag is very waterproof

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A very good water resistant bag to use during rainy days. Keeps the things inside dry and safe.


Hello, Amarnath

Thank you for your review, and we/re glad the product via the perfect rating and we truly believe it has made you feel worthy and of value to spend your money purchasing it. Thank you for your support, and we hope to see you at our stores soon!


Fidah Ngatijan

Sports Leader

Decathlon Singapore

Good bag for its price

A must have especially if you're a bike commuter. Surprisngly spacious inside, and does what it was touted it does in terms of waterproof-ness.


I used this in Canyoneering in Cebu. It's so light and it has pockets inside. Highly recommended!!!

Watertight Backpack is

Good quality, standard IMO color

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Waterproof bag

Brilliant bag for all seasons, especially with the British weather. Keeps everything dry, so spare clothes and important documents are completely safe and protected

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Great waterproof feature

It is large enough to put all my stuff and it's strong waterproof feature completely protects the things from water.

Great waterproof feature

This product has very good waterproof feature that products inside will never get wet. It is also large enough to carry many stuffs to practice watersports or go to the beach.

Good Price

Good Price, Good Quality

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Sturdy yet comfortable!

A4 pocket on the inside and the foam pads on for added comfort, allowed me to use it for both work and doing watersports. However, i have yet to test on how waterproof this bagpack is, but so far everthing inside was still dry in the rain. I would give it 5 stars if it had an added pocket on the outside so that i can put small essential things to retrieve it easily instead of having to opening and closing it from the main compartment over and over again. Overall great product!

Hi Faizah,

Thank you for the review about our product: "Waterproof Backpack 20L - Grey".

We are glad to hear that you find them great to use for both work & your watersports activities. We're also pleased to hear that, overall, you find them a great product, and I tell you what, we will strive to get a full 5-Star rating from you in future, and to do that, we certainly value your suggestion for improvement (to include an outer pocket outside the bag as you had mentioned so that it would facilitate you to retrieve your smaller essential items easily) and we will therefore relay this feedback of yours to our watersports teammates and the ITIWIT Design & Brand Team for them to pin up this valuable suggestion, for them to consider it in their efforts to effect a continuous improvement throughout.

We hope truly they are up to your expectations too, and certainly that they’re worth the money you spent on them. A last word, though you are already certain and had a great experience the bag protecting your items dry in the rain, they are truly built to protect them from splashes of water and for BRIEF  immersion in water (as what sometimes happened in brief immersion in watersports activities). So do not use it for total or a long immersion, though.

It is, therefore, ideal for kayaking, stand-up paddling or light sailing where splashes of water are of a regular and common thing. Hope this extra information tips you well...!!

We, in Decathlon, always strive to makes sports available to everyone via our affordable price, and we hope you are amongst those that has benefitted from this business philosophy of ours.

We hope to see you soon, when our Stores are allowed to  be re-opened, hopefully soonest. 
We miss our Stores too, but meantime, stay safe and take care, Faizah.

Stay healthy, keep fit & stay happy at home, during this circuit-breaker time!

Sports Advisor
Decathlon Singapore

"Keeping Fit Through Sports - and Decathlon!"
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Product information


Main fabric

  • 40% Thermoplastic Polyurethane
  • 60% Polyester

Precautions for electronic devices

Electronic devices are fragile and valuable. We recommend doubling up their protection by putting phones in waterproof pouches inside dry bags. Cameras can be put in a small dry bag (5L or 10L) placed inside a large dry bag (20L, 30L, 40L, 60L).Ensure your bags are closed and check water resistance regularly before your session using a paper towel.

Fastening system

To ensure good water resistance:1/ roll the top of the bag over carefully 5 times, folding tightly over the width of the strap2/ fasten the central buckle 3/ fasten the side bucklesLeave some air in the bag. The bag should appear inflated once closed: this makes it more watertight and allows it to float if dropped in the water.

Attachment on a stand up paddle or a kayak

The 2 compression straps on the body of the bag can be used to attach the backpack to an SUP or a kayak equipped with fastening loops, enabling you to carry your belongings into the water and protect them.

Technical dimensions

Waterproof capacity when closed: 20 litresHeight: 45 cmWidth: 30 cmThickness: 20 cmWeight: 726 g


Size Guide Visual

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