Pictured below are all the items that were carried in the handle bar bag and attached pocket.
Starting at the bottom of the photo and working up to the top are the items I used.
No.1 Small hand made note book used as a diary / log book , from Micheal O Brien Book binder NZ
No.2 A set of 12 alloy light weight tent pegs in a nylon bag
No.3 black Diamond mini head lamp with fade function
No.4 Mont Bell under helmet thermal cap
No.5 Water proof map case
No.6 Alloy folding wind shield for cooking
No.7 Mont Bell stuff sack ( this bag was used for clean clothes )
No.8 Mont Bell stuff sack ( this bag was used for dirty clothes )
No.9 Mont Bell burrow bag ( super light weight but very warm - not made of down )
No.10 Mont Bell U L Comfort system pillow 8cm height
No.11 Mont Bell U L comfort system mattress 8cm height
No.12 OR 10ltr dry bag
The above items worked well and in the small stuff sacks I had spare clothes, socks, pack towel etc both those bags were placed either side of the OR research dry bag which contained the sleeping set up. The Mont Bell U L Comfort system packs down really small as you can see from the photo above and the pillow attaches to the main mattress. I have tried compressed foam and small 3cm high air mattress but they are hopeless compared to the luxury of the U L Comfort system. The handle bar bag was designed around a 10ltr OR dry bag and once filled you still have extra room either side for other items , in my case spare clothes etc.
Pictured below is the Mont Bell U L Comfort system set up.