The outer bag is made from the normal material you'd see on any rucksack i.e. not waterproof. I think the liner is a great way to waterproof it considering it's replaceable.
It velcros to the top lip of the roll. You can't attach a zip to it because zips can't be made 100% waterproof so the next best thing is a roll up. I quite like the roll up because you can either roll it all the way down and make the bag compact, or roll it further up and allow for more room.
Roll bags are a tried and tested method of making something water/airtight. The outer material does get wet and the white insides mean you can actually see stuff in there.
I have some cheap karrimor rollbags and they're completely airtight too.
The R30 is basically a US30 roll bag with the rucksack parts, the US bags are 100% waterproof too.
Yeah the US and R30 bags all have the white internal 'liner' - the outside black material gets wet but doesn't let through loads of water, it's just not 100% waterproof. I've never has water sloshing about in them.
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