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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.
Stoo61-
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.
loadedcyclist2
know what you mean but I quite like them for the price. The smaller ones are definitely to be avoided though as the stiffness makes them pretty useless. The 15 litre ones are a really daft short stubby shape which makes them near useless for strapping to some things. When folded closed is nearly a football. Ortlieb medium weight (350?) far better, and ther 13litre bag is a nice long thin shape - good for strapping.