CASTELLICastelli Undersaddle XL, Black, OSFA

Good quality but I think if it was just a centimetre or two longer and centimetre wider it would be perfect,it has strength and looks nice,it has a mesh compartment on the outside which is stretchy and I use it for my mini pump but in my opinion an additional strap for this mesh which is open ended at both ends would make it safer because if you store something in it you could find it working loose,the straps that tie the actual bag to the bike do not really prove useful in securing whatever is in the outer mesh compartment.

The adhesive holding the strap together didn't last more than a season. It fell apart while I was descending and went flying at oncoming traffic.The shop I bought it from said it happened to someone else. Too bad, it was great while it lasted.

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.