BTR Waterproof Under the Bike Saddle Wedge Style Bike Bag

8 reviews
Same day shipping on orders placed Mon-Fri by 1pm

From the BTR All Weather Bike Bag range that are based on hiking dry bags, this is a mini version that attaches under your bike seat, so you can keep your belongings safe & dry & you can focus on your ride.

Under saddle bike bags generally get a raw deal from cyclists as they get splattered with mud & dirt. The all-weather bag by BTR bag folds down & clips together to create a dry & dirt-free area so your belongings stay dry & clean!

Our universal fit BTR All Weather Saddle Wedge Dry Bag is designed to keep your valuables secure & dry in all weather conditions.

Built in rear tail light loop so you can use this & your bike light so your bicycle remains visible

We also added plain reflective stripes on the side, so you have a practical added reflect & no excessive branding



  • 100% waterproof material - your contents stay dry
  • Roll down & easy clip waterproof bag fastenings - no zips or fastenings to let the water seep in - keeps your contents dry lets you access inside it fast!
  • Rear light loop– clip your red rear light on the built in loop. No need to compromise visibility for storage!
  • Universal fit - Adjustable straps ensure it attaches whatever the diameter of your seat stem & it stays put - does not move, shift or budge easily!
  • 3x Fastening straps - 1 x hook & loop that secures around your seat stem, 2 clips attach & adjust under your bike seat for maximum stability
  • Re-enforced base - our bag won't sag or get misshapen & catch on your bike wheels. Designed to retain its shape
  • Reflective stripes - on the side & reflective logo on the back – reflects headlights back to the source & so helps you to be seen & be safe!
  • Wipe clean material – easy to keep it looking good!
  • All weather bag – not only keep the rain out but the dust & dirt out too!
  • Width 9cm, Height 8cm, Length 18.5cm (when rolled shut)


Never worry about getting caught in the rain again!! Keeps your contents dry - Guaranteed!!

Delivery Information

FREE Postage -  Usually Receive within 2-5 Working Days.  

£2.00 - Receive item within 1-2 days


FREE UK Returns

We offer free returns within 28 days of purchase. (See Christmas Returns Below)

We offer Free Returns through Royal Mail. Please Contact Us to arrange your return


Christmas Returns

Anything purchased after November 1st 2021 for Christmas can be returned up until 21 January 2022



All items must be unused and still have the tags attached when they are returned to be eligible for this policy


BTR waterproof saddle underseat bike bag fixed onto bicycle


Customer Reviews
4.8 Based on 8 reviews
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  • gravel bike
  • side
  • space
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  • velcro
  • roll top
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Mark C.
United Kingdom United Kingdom
I recommend this product

Saddle bag

Great product. Great comm. Great service happy customer

Anita W.
United Kingdom United Kingdom
I recommend this product

Dry bag

Very good size dry bag. The rear light clip just maybe could be a bit sturdier, otherwise a good purchase

jeremy k.
United Kingdom United Kingdom
I recommend this product


Such a great bag for the short local blasts on my gravel bike. I didn't want anything too bulky, but at the same time big enough for essential items. Love it, thanks BTR!

Graham P.
United Kingdom United Kingdom
I recommend this product

Value for money

Good product but hoping the material will soften up over time as quite stiff. The one real negative would be the length of the strap which secures to the seat post. It's way to long and cannot be cut without cutting off the velcro used to hold it in place. Also wobbles around a bit but can't feel it when cycling. But still very good value for money.

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