I bought a pack of those and found them to be too much hassle.
Getting to the controls is a problem because the bit that says 'RAINSLEEVE' narrows too much - I cut it off in the end. The version in the pic is almost certain to be too long for your shorter lenses - and changing lenses with the cover on is near impossible (or at best, very risky). The cut-out for the eyepiece won't stay in the correct position unless you trap it using a viewfinder eyecup. There's no cut-out for the LCD screen, so you can't review pics/histograms properly.
Mine is the version without the flash cover. It's basically two plastic bags joined together (plus a bit of string on one end) - it might last for a few outings if handled with care.