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Waterproof Backpack 20 L

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Sale price: $49.99 Regular price:

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Model: 8387664

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Product Features

Waterproof Backpack 20 L is designed for carry and protect your belongings from the water while doing water sports.

This 20 L 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 20 L in use


Resistant to splashes, spray and brief immersion.


20 L usable capacity to hold small belongings and spare clothes

Carrying comfort

Ergonomic, adjustable, thick foam-padded shoulder straps.


PU coated and 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.


0% PVC

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Waterproof Backpack 20 L,carbon gray 

Waterproof Backpack 20 L,carbon gray 

Waterproof Backpack 20 L,carbon gray

Product Customer Reviews

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Waterproof Backpack 20 L,carbon gray
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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!"
Good quality bag

I am happy with the material of the bag. Looks simple and easy to maintain. I even try to put it on a rocky surface and there is no sign of scratches. I use it for fishing. Just nice for this heavy rain. My items very dry inside the bag.

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Hi Mr Mohamad Sabri Januri,

Thank you for your awesome feedback!

I'm glad you liked the product.
It is also one of our best sellers.

To add on, we will be bringing more waterproof bags next year, so stay tuned!

I hope to see you in stores soon!

Cheers and Best Regards,
Diana Ross, Swimming Sports Leader
Overall very pleased.

Can’t give more than good yet as it has so far only had relatively limited use. It if lasts well, and remains waterproof, then I would say excellent, but too soon for that.

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Simply does the job with no fuss, a great product. Used and much admired by others

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ITIWIT 20L watertight backpack

Quite simply, this is the best quality and value for money waterproof backpack on the market. I have a Patagonia and North Face - but this knocks the spots off them! If a larger (30L or 40L ) version is available, then you have an even better product!

Excellent bag for cycling

Perfect size for clothes, shoes and a laptop on my daily commute. Really comfortable straps and easy to fold. One addition that would be great would be a small exterior pocket for phone/wallet. Other than that it's incredible value when compared with other water-tight brands.

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Good backpack but more sizes would be better

The backpack has a really good quality (e.g. comfortable shoulder straps, easy to use folding strap, pockets inside the backpack) however I returned it as it was too small after all. @Decathlon: Please make more sizes available! I would have preferred 30L or more.

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Reasonably priced waterproof bag

Bought this bag for my son who's cycling around Europe and Central Asia. It is ideal, very sturdy, waterproof and very reasonably priced when compared to alternatives.

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Fills my daily needs, but wish for a little more

I ride bicycle to/from work and pack my office clothes inside no matter the weather conditions may be (snow, rain or shine). I purchase previously the 16 liters Tribord waterproof backpack. That one is sometimes a little small during winter when I pack more layers of warm clothes, a pair of shoes and my tablet/laptop with its accessories. This 20 liters waterproof backpack can fulfill my needs for the winter rides, but I wish the following features could be considered: 1. Add an external waterproof pocket just like on the old 16 liters Tribord waterproof backpack, so that small items like keys or wallet can be quickly stored without reopening the whole backpack. 2. Add an adjustable cord on both side clips just like the 16 liters Tribord waterproof backpack. 3. Add an inner bottom and back cushion to protect items that are carried. 4. In addition to the chest clip, add a waist clip that can help to keep the backpack close to the body when running.

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Additional Product Information


Main fabric

  • 60% Polyester cationic
  • 40% Thermoplastic polyurethane

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 (5 L or 10 L) placed inside a large dry bag (20 L, 30 L, 40 L, 60 L). 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 strap 2/ fasten the central buckle 3/ fasten the side buckles Leave 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 liters (1220.5 in³) Height: 17.7" Width: 11.8" Thickness: 7.9" Weight: 1.6 lbs



Product testing

WATER RESISTANCE TESTS: TEST 1: "PUDDLE OF WATER" The bag is resistant to shallow immersion for 8 hours in 4" of water. This test corresponds to a bag floating in a water-filled boat or to a brief fall into the water. TEST 2: "SHOWER" The bag is resistant to a shower of 450 L/m²/h lasting 4 hours. This test corresponds to heavy rains or splashes from waves.

Storage instructions

Rinse with clean water and dry the product before storing for long periods to keep the materials in good condition.

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For 40 years, Decathlon has delivered the best value in the retail sports industry by offering high-quality, sustainable and cost-effective products.

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