Like this site? Help us to make it better.


BTR Lightweight Corner Frame Triangle Bike Bag With Waterproof Zips



Cheap, effective extra storage for any bike

At every product is thoroughly tested for as long as it takes to get a proper insight into how well it works. Our reviewers are experienced cyclists that we trust to be objective. While we strive to ensure that opinions expressed are backed up by facts, reviews are by their nature an informed opinion, not a definitive verdict. We don't intentionally try to break anything (except locks) but we do try to look for weak points in any design. The overall score is not just an average of the other scores: it reflects both a product's function and value – with value determined by how a product compares with items of similar spec, quality, and price.

What the scores mean

Good scores are more common than bad, because fortunately good products are more common than bad.

  • Exceptional
  • Excellent
  • Very Good
  • Good
  • Quite good
  • Average
  • Not so good
  • Poor
  • Bad
  • Appalling

At only £15 BTR's Lightweight Corner Frame Triangle Bike Bag With Waterproof Zips (catchy name!) is well worth a punt if you're looking for a bit of extra, easily-accessible storage on your bike. It's a fair bit better than the price alone would suggest.

Pros: Inexpensive, well made, fairly rugged

Cons: You can't stow the straps so you have to cut them

At 25cm long, 4cm wide and between 6cm and 9cm deep this isn't the biggest frame bag you can buy, but there's room for a decent amount of kit in it. You could use it to stash spares and tools (I got everything from my well-stuffed Sticky Pod in it bar the pump), or snacks, or a cafe lock, or your phone and keys. It scores over a seatpack in that it's easily accessible from a riding position – just pull the zip back and have a root around – and it scores over a top bar bag (it's the same kind of size) because you don't knock your knees on it the whole time when you're out of the saddle.

15 of the Best bikepacking bags

The BTR bag is simple to fit, with three Velcro straps. There's no way of stashing the ends, and they flap about when you're riding, so the best thing to do is cut them to length; obviously that means you might be limiting your options a bit down the line if you decide to swap it to a chunkier frame. The straps are rubberised on the inside to protect your frame, and the whole bag is nicely made. Seams are tight and tidy, the material is pretty waterproof and so is the zip: a good dousing with the hose didn't push any water into the bag, so you should be fine in the rain. A dab of silicone grease on the zip will both help with waterproofing and make it a bit less sticky when you're trying to pull it open from the saddle.

Overall I was impressed, really. At £15 you can't expect miracles but this is a nicely-considered and well constructed bag that's genuinely useful extra space on your bike. It's a good alternative to a top bar bag or a bigger seatpack.


Cheap, effective extra storage for any bike

If you're thinking of buying this product using a cashback deal why not use the Top Cashback page and get some top cashback while helping to support your favourite independent cycling website test report

Make and model: BTR Lightweight Corner Frame Triangle Bike Bag With Waterproof Zips

Size tested: Height 6cm expanding to a max of 9.5cms Width – 4cms Length – 25cms at longest point

Tell us what the product is for and who it's aimed at. What do the manufacturers say about it? How does that compare to your own feelings about it?

From the BTR Race Range, ideal for road bikes or cyclists who like to travel light, our BTR Slim, Mini, Lightweight Corner Triangle Bag is ideal if you want a small, aerodynamic & streamlined & discrete Bicycle bag.

The BTR Small & Streamlined Lightweight Corner Triangle Bag was created to provide discrete & secure storage on your bicycle & is a Popular Choice for Cyclists who want to carry minimal gear & not have additional storage interfere with their performance!

Tell us some more about the technical aspects of the product?

Three Straps - to Secure to your Bike – Don't take Any Chances... Keeps it Secure

Velcro Fastenings – Easy to adjust & Secure to your Bike

Reflective Logo & Stripes – printed on the side. Be Seen & Be Safe!

Easy to Clean Structured Shell - keeps its shape & dirt & dust wipes off easily

Waterproof Zips - helps prevent any drips getting inside the bag

Water Resistant Material - helps to repel rain & splashes

0.6 Litre Capacity - mini size but can fit in your basic essentials

Rate the product for quality of construction:
Rate the product for performance:
Rate the product for durability:
Rate the product for weight (if applicable)
Rate the product for value:

Tell us how the product performed overall when used for its designed purpose

Very well

Tell us what you particularly liked about the product

Inexpensive, well made, fairly rugged

Tell us what you particularly disliked about the product

You can't stow the straps so you have to cut them

How does the price compare to that of similar products in the market, including ones recently tested on

At £15 it's worth a punt, it's cheaper than most of the other options

Did you enjoy using the product? Yes

Would you consider buying the product? Yes

Would you recommend the product to a friend? Yes

Use this box to explain your overall score

It's cheap so you might expect it to be cheerful, but in fact it's a pretty good quality bit of kit.

Overall rating: 8/10

About the tester

Age: 45  Height: 189cm  Weight: 92kg

I usually ride: whatever I'm testing...  My best bike is: Kinesis Tripster ATR, Merida Scultura

I've been riding for: Over 20 years  I ride: Every day  I would class myself as: Experienced

I regularly do the following types of riding: road racing, time trialling, cyclo cross, commuting, touring, club rides, sportives, general fitness riding, fixed/singlespeed, mtb, Mountain Bike Bog Snorkelling, track

Dave is a founding father of, having previously worked on Cycling Plus and What Mountain Bike magazines back in the day. He also writes about e-bikes for our sister publication ebiketips. He's won three mountain bike bog snorkelling World Championships, and races at the back of the third cats.

Latest Comments