Perfect size, enough to fit co2, tube and the keys.

Good fit , easy to remove. Enough place.

Bought my first one on sale and it works well so I grabbed another on sale. I wish they were larger but its perfect regardless. This will barely hold a full sized tube but is great for a phone or wallet/keys to keep your pockets free. It keeps things dry and stays put. The velcro is holding up after almost a year of weekly use.

Awesome design but it’s too small,good for 1 tube and 1 co2 and that’s pretty much it!!

The bag itself is fantastic - no quarrels there. However the two button head screws which are provided to attach the mounting bracket to the female threaded inserts in the bottom of my specialized power saddle came with a lot thread lock. To the point where the threads are completely jammed, and VERY high torque is needed to get the screw in. I think Specialized is absolutely correct to use thread lock in this application, to prevent the screw from backing out due to vibration. However they provide too much to the point where it prevents proper installation. The threaded insert on my saddle has now broken loose, I will be requesting a warranty replacement for my damaged saddle - sad! I think this is a failure on Specialized's part - they created the SWAT system, they have full control of design and manufacturing, there's no excuse for them to get this wrong. To Specialized: yes, make custom saddles, and yes make custom accessories which integrate nicely with them - but execute it well. Then I'll gladly pay money for your products.

A tube, multi tool and car keys fit tightly and the Velcro seems to hold everything so far. Easy to dismount from the seat with SWAT versatility. I do wish it was just a few cm's bigger! All in all it's a nice storage option. Will be adding one to my wife's bike as well.

Easy to install and fits snugly under the seat with now protrusion.

The mount, bag shape and magnet closure are all great, but the velcro doesn't stay closed unless the bag is nearly empty. The hard mount is also SWAT proprietary (shocker) Soon as you get a tube and cartridge in there the chances of it popping open on the trail or on the railroad tracks/potholes etc is 95%. I ended up modifying mine with aditional rubber straps to stay closed but will be ditching the bag all together asap because it and my henge seat are hindering my riding experience.

I like this product, I got the small one and it can fit my wallet, keys and a small multi tool. The only problem is that if you have a full suspension bike the rear tire touches the pack when jumping drops. I think this product would be great for a hard tail, gravel, or road bike.

I purchased the Stormproof Seat Pack (small) for my 2020 Roubaix Pro. It is well-engineered and uses the SWAT mount to elegantly clip under my Specialized seat. It is small, but I only need room for a tube, two tire levers, some latex gloves and a couple valve adapters. It's perfect and keeps things tight and out of the way. Highly recommended!