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hippy-
Alpkit do their lightweight ones in those sizes but they don't have any attachment points.
Do you reckon a feedbag-type thing might work with your bar set up at all? https://www.revelatedesigns.com/index.cfm/store.catalog/Cockpit/Mountain-Feedbag
atk
Do you have room to strap layers between/under the aero bars in a small (1-2L) drybag or similar?