SILCA Mattone Grande | Bicycle Seat Bag Secured by BOA Capture System | YKK Waterproof Zipper | 77 Cubic Centimeters of Storage Space | Bike Saddle Bag

Great!

If you need a compact bike bag look no further this is the best. I mountain bike on rough trails 3 to 4 days a week, I carry a tube, mini auto pump, tire removal levers, multi tool and an extra quick link and it tucks nicely under the back of my saddle. Extra bonus is the bolo ratchet mounting strap that holds it securely in place. It’s out of the way, rugged and holds every thing I need. I might mention this is the larger size but still hides away nicely under the saddle. Only on a few occasions with my dropper post all the way down and thrashing through some steep valleys has it slightly rubbed on the tire when shocks fully compressed. Super easy to install. No regrets

I wasn’t sure which of the two sizes to purchase and initially went with the original Mattone…which was too small for my liking. I ordered the Grande and it’s perfect. There is nothing bulky about it IMO, and I can fit everything I need inside for pretty much any ride I would go on that didn’t need a change of clothes. I keep a multitool, two CO2 cartridges and a regulator, a tire lever, tubeless sealant, tire repair kit, and have room for keys, cash, and card. It fit’s perfectly behind my seat with room for my radar/light on the post. After reading some negative reviews about the zipper I decided to put on some zipper wax from my SCUBA kit. Seems to work fine for a waterproof zipper.

Admittedly I am a fan of Silca products, typically very well designed and quality build. This is the best seat pack I've used, I have two, one for my gravel bike and one for my road bike. I prefer the "grande" as it's got about the perfect amount of space in it for my needs. Holds tools, spares, inflator, waterproof in all but perhaps the most extreme conditions. Attaches easily and securely, doesn't flop around when you are climbing out of the saddle. Unobtrusive, doesn't spoil the looks and the lines of a nice bike.

As the title says, it's a good product overall. I'm using it on my MTB (trail) and I do not regret the purchase.However, I challenge the claim that the zipper is water proof. Based on the amount of water in the bag of I rinse the mud of my bike, I'd say it's water resistant at best.

I have the regular size bag on my road bike, I put this one on my mountain bike.

This bag is well made and holds 29” tube, small zip ties, tools and more. Tools do not clank around. Fastener is awesome as it cinches up nice n tight. No strap to go around seat post, so when post is dropped, bag does not interfere. Although a bit pricey, it’s worth it as you will not find anything to compare in quality and convenience.

Switched to larger tires, so needed larger bag for tubes. The SILCA Mattone Grande does the job perfectly, holding 2 tubes, 2 Co2, levers, spare AXS battery, multitool, and master link. The only caveat is that the bag must be removed to get to the contents. Since I don't store anything in the bag that I need fast access to it isn't a big deal, but if you use your bag to hold a phone, gels, snacks, etc., there are probably better options.