20L Watertight Backpack - Grey

Ref :
Key feature
This 20L backpack lets you carry your belongings and protect them from splashes of water and brief immersion. Ideal for kayaking, stand-up paddle or light sailing.
Users reviews
4.33 / 5 46 ratings


User benefits

Resistant to splashes, spray and brief immersion.
20L usable capacity can carry small belongings, food and clothes
Carrying comfort
Ergonomic, foam-padded shoulder straps.
PU coated & TPU laminated 600D 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


Main fabric : 60.0% Polyester (PES), Main fabric : 40.0% Thermoplastic polyurethane (TPU)
WATER RESISTANCE TESTS: TEST 1: "WATER SPLASHES" The bag resists surface immersion for 8 hours in 10 cm of water. This test corresponds to a bag floating on a vessel filled with water or brief fall in water. TEST 2: "SHOWER" The bag resists a shower of 450 L/m²/h for 8 hours. This corresponds to storm rainfall or splashes from waves.
made for
carry and protect your belongings from the water while doing water sports.
2 years


Storage Tips
Rinse with clean water and dry the product before storing for long periods to keep the materials in good condition.
Restrictions on use
Not suitable for canyoning or snorkelling (long immersion).


Precautions for electronic devices
Electronic devices are fragile and valuable. We recommend doubling your protection by placing telephones in watertight pouches within the duffel bag. Cameras can be placed in a small duffel bag (5L or 10L) inside a large duffel bag (20L, 30L, 40, 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 strap 2/ fasten the central buckle 3/ fasten the side buckles Leave some air in the bag. The bag should look 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 specifications
Watertight capacity when closed: 20 litres Height: 50 cm Width: 30 cm Thickness: 15cm

Users reviews

4.33 / 5 46 ratings
41 users recommended this product
Favourable review more useful
That review has been deposited on this product version
01 January 1970
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.

Critical review more useful
That review has been deposited on this product version
30-39 years old
01 January 1970
Use since 1 week or less
Très content... au début!

Et le début ne dura malheureusement pas longtemps!
Avant tout le positif: le sac est étanche au projection, pour de vrai et il est dans l'ensemble plutôt bien pensé... Il y a de la place, une petite poche pour mettre les effets personnels auxquels vous auriez besoin d'accéder rapidement...
Gros mauvais point par contre (ce n'est peut-être qu'un défaut du mien) la fixation basse des bretelles sur le sac... J'ai marché 2h avec lors de la seconde utilisation et le revêtement étanche c'est purement et simplement déchiré... Je me retrouve donc avec certes un sac, mais plus du tout étanche! C'est dommage d'autant plus que j'ai égaré le ticket de caisse...

Brand's answer :

Bonjour Monsieur
Je vous remercie pour votre avis et je suis désolé pour ce désagrément.
Il n'est pas normal que le sac ai lâché de cette façon. Il est possible qu'il présentait un souci de fabrication.
N'hésitez pas à le ramener en magasin pour vous le faire échanger.
Pour vous éviter les soucis de factures, je vous suggère de prendre une carte Decathlon, elle garde l'historique de vos achats et vous facilitera ce genre d'opération.
Irwin Wouts - Chef de Produit

  • Man
    20-29 years old
    22 September 2017
    Use since 2 to 8 weeks
    That review has been deposited on this product version
    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.

  • Man
    20-29 years old
    17 September 2017
    Use since 2 to 8 weeks
    That review has been deposited on this product version
    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.

  • Woman
    50-59 years old
    09 September 2017
    Use since 2 to 8 weeks
    That review has been deposited on this product version
    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.