Just came across a top tube bag with fixing holes designed to fit into bolt holes on the top tube.
I don’t think I hav ever come across a bike with upward facing bolt hole mounts, next to the stem.
Anyone else come across this bizarre setup before ?
What percentake of biks have these holes - 0.1% or less ?
Literally every new TT bike has them.
They are de rigeur
Yep my P3 has them and I have an Xlab stealth attached to them.
Thanks all - never ever seen them before but that probably just shows how old I am and how long it is since I looked at a tribike (14 years i think)!
I only know because I had a look last year when I needed a bike.
Gravel bikes have them, too.
But don’t get one of those 
Yeah got 'em on my P3 and I bought the X-Lab Stealth Pocket 500 to bolt on there.
Bike and Bento Twins 
