thanks all,
I don’t want to loose the dropper post and even with a normal post id have to drop it for descents so anything under the seat would rub on full travel, I tried strapping my matt there one time. I will try and see how big I can go though and see how the pipe insulation works out.
I did look at the stem cells but thought the bars would be too crowded, I have got an old chalk bag though so will try that.
I hadn’t thought of another top tube bag at the seat tube so will try that.