CastelliUndersaddle Mini Bag

I have been using this bag for years. One of mine got a little frayed around the strap after countless bike changes. So I decided to replace it with this one. It holds all of the essentials: cartridge and inflator; lever; road tube; spare flip phone fir emergencies. Without the phone, I am sure that it could accommodate a MTB tube as well. It’s important to note that it is water resistant, not 100% waterproof. Still, it does a better job in this regard than 90% of the other bags I’ve tried. The simple Velcro strap set up is far superior to more complicated nonsense, including anything that involves a snap-in gizmo or a superfluous loop that goes around your seat post. It keeps in place and it totally secure. No ‘dork factor’ with its low profile and black-on-black look, too. Highly recommended.

This fits perfectly on my caad optimo. Castelli makes a solid product. I can fit a silca inflator with two cartridges, tire levers, and a tube. Highly recommend this.

I should have bought this sooner. It doesn't rattle under the saddle and holds everything I need on the ride. I carry a bike multi-tool, patch kit, two tire levers, multi-tool, and mini-flashlight.Update: the velcro gave out and the bag kept falling off. I frequently ride offroad and easily used this for at least 2k miles.

Love this saddle bag. Just big enough for a tube, co2 pump, levers and a micro multi tool.Looks really a sleek on the bike, no movement when riding.

Cuando recibi este bolsa pensé que seria muy pequeña, pero para mi grata sorpresa entraan sin problema: un tubo, una botella de CO2 y las palitas para remover la llanta y aun sobra espacio para una CO2 adicional o para una multi herrmienta. La bolsa además es muy elegante y luce muy bien eni bici cleta.

I was looking for a small under the saddle bag and this one is just perfect. in my case I was able to fit a Spare tube, CO2 cartridge, CO2 adapter 2xTire levers, Valve extender, a Multitool and additional battery for my Power Meter. It is tight, but it works perfectly and it does not create the bulk that other saddle bags do.

Not to small or too big, just right.

The Castelli saddle bag is the perfect size for two tubes and repair items, mounts easily with no exposed Velcro to tear your shorts, waterproof, perfect.

As I embark on longer weekend rides, it is important to ensure that I keep some basic tools with me in the case of a mechanical/puncture. I have been risking my rides up until now, but finally got myself a worthy saddle bag. Many I have previously come across before seemed to be overly bulky, and I was looking for one which was discreet, compact, and looked good. When I saw that there was a matching saddle bag available, my interest was piqued.The saddle bag itself is very well made. I opted for the smaller model, to keep things as discreet as possible. There is one main compartment which closes with a zipper. Inside there is a separate netted sleeve, to help secure smaller items. The saddle bag has a strap which allows you to mount it very securely under your saddle. It stayed put throughout a recent 87km ride I did. Although a fairly tight fit, I have managed to get the following neatly tucked inside:-Inner tube-CO2 pump-CO2 canisters x2-Tyre levers x2-Puncture repair kit-Disposable gloves-Disinfectant wipeThe saddle bag is at maximum capacity with the above, so unfortunately there is no room for my multi-tool, which I will have to keep in my jersey pocket. The saddle bag is actually just for weekend rides, as during my commutes I have a backpack with me, and have plenty of storage space there. All-in-all, the Castelli saddle bag is a great buy.