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Actually just picked one of these up for the same purpose! Like the vent to help squash it down.
https://www.decathlon.co.uk/p/trekking-waterproof-compression-cover-20-litres/_/R-p-311987?c=GREEN
No-one asked but if anyone is getting a Jack and wants to carry clothing and stuff, after some experimentation, this is the best dry bag I've found for size, fit and ease..
https://www.decathlon.co.uk/p/waterproof-dry-bag-5-l/_/R-p-325038