Looking at the measurements and taking the tape to the frame it looks like the Medium would fit except for the 3.5cm bit at the front of the bike. It'd be squashed.
Part of me is thinking I'd be okay with that as I'd still be getting more storage space overall anyway. Anyone done this on their frame, does it cause some annoying issue?
https://www.apidura.com/shop/expedition ... rame-pack/
https://www.cannondale.com/en/USA/Bike/ ... 806888b5aa
3L or 4.5L Apidura frame bag on Medium Topstone
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I used to use Apidura, but am now using Miss Grape (much better quality) .... check their sizes:
https://www.missgrape.net/en/products/
https://www.missgrape.net/en/products/
Trek Emonda SL6
Miyata One Thousand
Miyata One Thousand