Not with yer on that Cliff. What specifically? If you mean dry bag, I'd go for the bigger 50 litre and just pack down. I got the 20 litre yellow one cos it was on offer on Amazon and it looks nice a strong, which it is. A 4 season down bag will fit in the 20 litre one easy and you should be able to bung some clothes in as well. Still doing the 20 litre one on Amazon for £20 and you get a 5 litre bag thrown in, which is just the right size for storing electrical stuff you may want to keep dry.
https://www.amazon.c...s=dry bag valve
That said, I'd still go with a bigger 50 litre, because I put my sleeping bag and all of my clothes in one. There's one on Ebay for a decent price, though I can't vouch for it's quality. At least the valve is at the bottom, unlike the Highlander one I have with the valve half way up--must have been hitting the Buckfast when they designed that one
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Thanks Len, must of missed this previously, good info but that one on amazon is currently unavailable, will find another..
Tote bags are a good solution for anyone looking to line E21 panniers with, not concerned about being waterproof as items will be stored in plastic then the tote bag and the panniers are completely waterproof.