I've got a thicker drybag already so the idea was to do exactly what you say, compress and shove inside another bag.
Cool. Personally I wouldn't other with compression one you can get 8/10 of the effect with a knee.
The difference with some of the valved ones is a few euros and a few grams. Seems increased simplicity might be worth that. Will have to have alook around
@skinny started
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I've got a thicker drybag already so the idea was to do exactly what you say, compress and shove inside another bag.