I needed a compression drybag quickly - the Sea to Summit design works really well as you can compress a sleeping bag in it, put it in another tough drybag (as it would be in a kayak hatch) and then sit on it to squash further. The event fabric means both dry bags will now compress - which would not work with two normal dry bags. No need to press a “purge” point.
The price was a very good discount and the express dispatch (plus Royal Mail doing their bit ) meant I got it in time.
Result: Super happy paddler with dry sleeping bag, quickly packed each day.