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Btwin 500, 0.4 L Saddle Bag

Sale price: $8.00 Regular price: $12.99

A small, semi-rigid bag, that's easy to attach to and remove from any bike saddle. Foam lining to protect your belongings and reduce noise. Key pocket.

Color: Select a color
Size: Select a size
Sale price: $8.00 Regular price: $12.99

Free shipping over $35

Final Sale: No returns or exchanges

See our return rules

Free pickup

San Francisco, 735 Market St. Options

Select an available color and size to see options.

Model: 8354447

Product Features

Btwin 500, 0.4 L Saddle Bag | transporting the minimum needed for bike repairs and small personal belongings.

A small, semi-rigid bag, that's easy to attach to and remove from any bike saddle. Foam lining to protect your belongings and reduce noise. Key pocket.

A photo of the Btwin 500, 0.4 L Saddle Bag in use


Capacity: 0.4 liters. Can fit a spare inner tube, tire levers, patch kit, etc.

Easy assembly/dismantling

Easy to attach using universal, dual fastening straps with rip-tabs.

Easy to use

Easy to open with the zipper Rigid reinforcement. Easy to clean with water.


Dual-attachment system onto seat post and saddle rail.

Item protection

Semi-rigid and foam lining to keep your belongings safe.

Multiple compartments

A small key pocket with a rip-tab strap.

Product Customer Reviews

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754 Reviews
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Btwin 500, 0.4 L Saddle Bag,black
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Small and light

If you want something Small and light this is a cheap option. Velcro band will make it fit under most seats. The is the smallest size, you could make your decision for your needs. Mine fits a multi tool an a small patch kit. It even has a key chain loop. If you want to go light this is a good option.


Perfect size

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Hi Jennifer,

Thank you for taking some time to review our 500 Bike Saddle Bag S 0.4L.

We are glad to hear it fits everything you need on your bike rides.

We look forward to seeing you soon!



Communication Leader, Décathlon Ottawa

Great bag, one small issue

Really roomy bag and great value. It looks stylish and compact but I've been able to fit a surprising amount in: 2 inner tubes, 2 levers, multi-tool, 2 CO2, and a mini pump. My only gripe is that the velcro strap which attaches to the seat post hasn't been attached in the middle of the bag meaning that it isn't possible to get it to sit straight. Not sure if this is a general issue or just a problem with my particular one.

Does the job

Excellent product at a very good price. Fits in a spare inner tubes, tool and tyre leavers. With all fitting snug inside and the adjustable straps connecting well to the seat i’ve ex no rattles or noises.

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Saddle bag 0.4l

Bag great and able to carry a spare tube,repair kit,levers,multi tool and gas cylinder, I am at a loss though as to why I was cared 10p for a PAPER BAG the 5p charge is for plastic so who gets this money??? Thinking twice now about any future purchases from there.

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Saddle pack

Used on tour of Flanders and had holes in it at end of ride. A good price but I expected it to last more than one ride.

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This product should last for years. We have not had such feedback before therefore I can only assume that it is a one off issue. Please feel free to exchange it at your local store without a receipt as you are a decathlon card holder.
Peter Lazarus UK Cycling Market Manager DECATHLON
Too Small

Product quality is good, but the size is too small. In the product description it states it is able to hold an inner tube, tire levers, CO2 canister and puncture repair kit. It was almost full with a packet of tissues, set of keys and energy bar.

Hello Simon,

Thank you for supporting our product. We appreciate your insight and feedback as you motivate us to strive for outstanding product quality.

We are looking forward to seeing you again.

Thank you again for your support. 

Stay healthy. 



Decathlon Hong Kong Cycling Team


Good saddle bag

Fits well to my bike saddle using the velcro straps. Light weight and water proof. Enough room inside for 2 inner tubes, set of 3 tyre levers and a puncture repair kit. Great value.

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Like good


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Dear Miqdam, thank you for your time in rating our product. We are glad that we managed to delight you with the standards of our product. We have read through your comments and will take note of these points into improving ourselves to better satisfy your needs. Thank you once again for your time and we hope to serve you again soon!


Sport Advisor (Wheel)

Mainly for MTB with seat post dropper

Only able to fit this little tiny small bag on my MTB with seat post dropper. But don't expect top quality. But value for money. Only can fit either a spare tube or simple tools but can't fit both. Something need to let go for others. Given choices go for bigger saddle bag for more storage.

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Dear Yewen,

Thank you for your time in rating our product. 

For your information, we have various types of bicycle saddle bags with different sizes.

This saddle bag is design for content protection with semi-rigid and foam lining to keep your belongings safe.

If you looking for bigger storage, we would advise you to visit any of our stores or browse our website to compare the benefits and technical information about our saddle bags.

Thanks to Decathlon Membership Benefits, our members able to enjoy 365 days return policy* without any hassle if you're unsatisfied with the product you have purchased.

We welcome you to any of our stores if you wish for product exchange, or advise & tips from our cycling experts.

Thank you once again for your support with Decathlon Malaysia and we hope to serve you again soon!

*Terms and conditions applied

500 Bike Saddle Bag S 0.4L - Black B'TWIN


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Hi Khairunnisa, terima kasih kerana memberi kami penilaian 5 bintang untuk produk kami. Kami amat bersukacita apabila kami dapat menepati jangkaan anda. Kami amat menghargai kesetiaan anda terhadap Decathlon. Anda boleh hubungi kami sekiranya anda mempunyai maklum balas untuk kami perbaiki pada masa hadapan. Terima kasih sekali lagi kerana meluangkan masa dengan memberi maklum balas kepada Decathlon dan kami berharap dapat berjumpa anda lagi!

Nishapreet Kaur Lett

Couldn't be better

One thing it's water handle well on heavy rain

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Lightweight Saddle Bag

Very affordable, works as it should and no problem in getting it from the various outlets it online.

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Hi Chee Kwang,

Thank you for taking the time to write us a review regarding our product: 500 Bike Saddle Bag S 0.4L - Black!

In Decathlon, we believe that to get this kind of information from our users is the best way to improve what we are doing. We are glad that you are satisfied with our products :)

Do check out more variety of our products at, and we hope to be able to serve you again in our stores soon! :)

Stay Healthy, Be Sporty!

Sport on safely!


Digital Interaction Relay

Good investment

Great size for tools and simple first-aid supplies

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Hi Woon Ying,

Thank you for taking the time to review our products. We are pleased to hear that this item meets your expectations!

We look forward to more of your reviews and sharing! Plus, the new Decathlon app has been launched and you can now purchase all your favourite sports goods with just a few clicks on your smartphone! Yes, it's now available both in the App store and Google Play Store! Download now and happy shopping!

Thank you for your support and stay safe! :)

Sport on safely!


CSM Digital Leader


sympatická brašna do které se vejde náhradní duše, nářadí, spojka na řetěz, 2 bombičky, klíče, peníze.

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Additional Product Information


Outer fabric

  • 50% Polyester cationic
  • 50% Polyamide


  • 100% Polyester cationic


  • 100% Polyethylene low density


This bag can hold: - 1 road inner tube (700) + 3 tire levers + 1 multitool + 2 x CO2 cartridges OR - 1 MTB inner tube (27.5") + 3 tire levers + 1 multitool


This product has a hook for attaching a VIOO Clip, an LED light that can be clipped on and off anywhere in an instant. With a red or white light that can be used in continuous or flashing mode, the Vioo Clip makes you clearly visible from up to 130 yds away. Battery life is 9 hours in flashing mode, 4½ hours in continuous mode. Easy to recharge via a USB cable (sold with the VIOO Clip).



Storage instructions

Dry the contents in case of rain.

Superior quality. Unbeatable prices.

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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