Oxford Aeropack Xpert, £40 (£36.09 on MCN shop)
Miles covered/time: 3500/6 months
What’s good? For any load short of my hefty security chain and Abus padlock I favour a rucksack.
This is the least-niggly, most bike-optimised one I've tried.
The big, flat straps do up easily and securely in an x-shape across my chest with a single clasp, it's big enough to hold my 17" laptop and lunch when unexpanded and it'll even swallow a helmet when expanded.
Zips are completely wind-tight and it hasn't even leaked yet.
What's not? Like any rucksack it's a pain in the neck, shoulders and back with a really heavy load.
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