Double Bagging it

Following on from my test run I've decided to purchase a set of these www.ortlieb.com/_pdf_en/sack-ps.pdf

While I'm sure the bags I've got are waterproof it's more for getting
the kit into the tent dry, and not in some sodden bike bag.

As an aside, trying to make this post via the iPhone so here's hoping
it works as that'll make posting while on the trip considerably easier.