CastelliCastelli Undersaddle XL, Black, Osfa

Had a micro bag for my skinny-wheel road bikes. Found it handled a tube, patches, multi-tool, and levers without a lot of wasted space, and could grab the saddle nicely. And then I got a new ride with 28s. Maybe up to 32s eventually. Squeezing that bigger spare tube into my trusty old micro bag was just too much, so, time to shop. Saw this reviewed somewhere, then found it here at Amazon. Sadly, unable to find the Castelli Undersaddle in the shops I checked, so, there I am, reading online reviews and mining for specs on this thing. First off: don't let the "XL" label fool you. This is any other company's mini. And that's good. Wasn't sure I liked the 'boxy' design, but then noticed the pump sleeve on the bottom, and that was it. Ordered. Fits my larger tube and all the other stuff with a little space to spare, while holding on tight and not looking huge. And offers what I consider the nicest mini-pump option. Kudos to Castelli for thinking outside the box on this one.

I got the XL version knowing from other reviews that this was still a small bag. Some people however do indicate you can fit enough things in there for what I needed. Unfortunately that turned out to be inaccurate, I could not fit all my stuff, which was:2 x 23mm tubes - with 1 tube it all would likely fit1 x multitool2 x levers1 x mini chain tool2 x co2 cartridges with inflatorThis bag does look quite nice material wise, and being real small really does not obstruct from the bike's appearance. But for me that was also its downfall. Too little to be very useful. It's fine if say you used single tube rather than 2, but I wanted to use this for longer rides, like over 4-5 hours so using single tube wasn't comforting enough for me. I bought Topeak Wedgepack in Medium size which is much better for what I needed.

I read the other reviews and was not expecting a big bag. It is high quality and looks nice. It is easy to remove if I want to lock my bike up. I keep a multi-tool, a patch kit, two tire tools and a couple of CO2 cartridges in it. With hose items it is full! No way you are going to put tools and a spare inner tube in it. Your phone or wallet? Forget it. So if you want a nice small bag to hold the basics, this is it. Otherwise look elsewhere.

I have multiple Castelli clothes and they are top notch. When I saw this saddle bag with a longer profile to be able to fit 2 tubes and having a mini pump holder, I thought I had found the perfect product. I was stunned to see how bad this bag was. Really surprised and very, very disappointed. The material is very cheap, thin and would not hold up more than a couple of months. The zipper was very poor. I had to hold the bag and wrestle with it in order to get it to close. I returned it pronto.

They call this an XL Cycling Saddle Bag but it's not really that big. However, it is big enough to hold my multi-tool, spare inter-tube (could probably fit two), a couple leavers, and a small pump so it works for me.

Love this bag, it fits 2 tubes, 2 co2's, levers and a multitool in a very small bag. I thought it would be too small when I received it and was surpised at how much it fits without being overstuffed. It looks AMAZING too, i don't like the wedge shaped ones. Love it. Great bag, awesome Castelli quality, like always.;

Fits quite a bit. Would fit an emergency THIN vest if needed. (Only)I have tube, CO2 pump with extra cartridge, tire levers, multi tool, money clip. Slight room to spare. Won't fit modern smart phone, but if it were any bigger it would be a handlebar bag 😂

Fit everything I needed. I have a 29er and I bought another bag that looked big couldn't fit my inner tube. This one has 1 29" inner tube, co2 + dispenser, tire lever, and my multitool. Doesn't get in the way and has a nice low profile. Also like the feel of the zippers and the quality of the material.