I think there's a lot of selection for rain covers at similar price range: I use a similar product from Matin. If you want to go fancy, there's always the one from ThinkTankPhoto.
However, a note about these rain covers: since a lot of these accomodate long lenses, you might find it a bit awkward with more cover than needed for your 28-70 (I try to use my 70-200 when I put on the rain cover so there's no flabby left-over material dangling from the lens).
There's also the option of DIY - makeshift rain covers can be made from a cheap plastic bag or even hotel shower caps.
By the way, I'd recommend bringing both lens paper/cloth and a rocket blower. The blower is actually faster (blow the waterdrops to the peripherals) and leaves no traces compared to wiping the lens.