BTR Waterproof Under the Bike Saddle Wedge Style Bike Bag

6 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


FREE UK Returns

We offer free returns within 28 days of purchase. 

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



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 6 reviews
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  • gravel bike
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  • space
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  • velcro
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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.

Greg J.
United Kingdom United Kingdom
I recommend this product
I should have bought two....

Excellent purchase for my gravel bike. Like the title says, I should have bought another for my road bike. The only issue is that it won't quite fit my Cranks mini pump, but I've managed to incorporate it into the seat attachments and it's really snug. Looking to get a 2nd for the road bike now. Sort of feel i want to not recommend this so as should you restock I've a better chance of buying another ;)

BTR Direct Sports BTR Waterproof Under the Bike Saddle Wedge Style Bike Bag Review
daniel B.
United Kingdom United Kingdom
I recommend this product
Fit and forget.

I wanted something to pack the essentials in for short rides on the trails when I didn’t want to carry my daysack, tube, patches, multitool, cable ties, £20 note and a couple of energy gels. This pack swallowed the lot with room to spare for my phone and keys, theres a bit of space left but you can pull the fasteners down and stop it rattling about. The pack is really well put together and all the seams and fittings are sealed on properly and the roll top secures on the side of the pack to keep it neat (I’ve used something similar for years in the army to keep my kit dry). If there’s a negative, you can use it on more than one bike easily so you might forget a valve adaptor and extender if you switch between bikes with different wheels.

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