How about a foam filled, combined backpack/aero-enhancer that you wear on your back?
(If you have a passenger, the passenger simply wears it on their back)
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2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
2017: 209.14L for 4244.00km => 4.93L/100km (47.7MPG US)
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