Ah I think I see what you mean - looks like the corners are darted so that it curves around the bag...
Don't think that would work too well with compression straps etc - as they change the depth of the bag. Also with suspension strapping on the top - this should pull the flap round the corner avoiding it, so shouldnt be neccessary.
Might be worth picking up some seam sealant (tent shops sell it) to use on your bags seams - should help prevent water getting through (although it will wear off eventually)
Ah I think I see what you mean - looks like the corners are darted so that it curves around the bag...
Don't think that would work too well with compression straps etc - as they change the depth of the bag. Also with suspension strapping on the top - this should pull the flap round the corner avoiding it, so shouldnt be neccessary.
Might be worth picking up some seam sealant (tent shops sell it) to use on your bags seams - should help prevent water getting through (although it will wear off eventually)