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I meant the drybags.
as here:
https://www.planetx.co.uk/i/q/BAPODTOTV2/podsacs-roll-top-waterproof-dry-bagPersonally, because of issues noted above, I wouldn't go below the 25 litre one (but then I use a rack) - great value at currently £9.99 though. I like Podsacs stuff - used to do some good small strong mesh stuffsacks but haven't done those for a while.
For straps I used rokstraps (beloved of the motorbike fraternity) and Nitize adjustable bungees - sod conventional bungees - work of the one-eyed devil.
The smaller PX packs? I have the small seat pack. I only just noticed myself that there is a plastic insert that comes out that makes them way more flexible...if thats what you were referring to.
I got two PX dry sacs for fork bags but they weren't the right shape as you say. I went for AlpKit fork bags, in the end, and was very happy after replacing straps with Voile. Although it hardly rained on my big tour, cant comment on waterproofing for instance.