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Ah yes, I did mean adding an extra bend. But I can see how that would complicate things. I’ve bought a cheap PlanetX seat pack for now, as framebags are already a bit daunting. But might see about modifying it to take a similar harness for starters.
Sounds like a chunky molded zipper with a flap over it would be a good option? I don’t think I’d need absolute waterproofness anyway, the stuff that needs to stay absolutely dry can go in the dry bags on my bars or under my seat.
I did think about just using the chainstay mounts but it would have meant a very different angle for the dry bag or an extra bend in the tubing plus this way I can also swap the whole system over to another bike like my hardtail which doesn't have mounts. As for the frame bags, I don't think zips are inherently a worse option as long as it's a good chunky zip and not one of the waterproof ones. For example the water-resistant one on my half frame bag is pretty much knackered now after quite extensive use despite me cleaning and lubing it. On the up side I now how to replace a zipper so the bag itself should still live on. The roll top bags also take a bit more work to stop the contents bulging outwards and interfering with cranks etc. when you don't pack them carefully.