Unless you need to have the camera ready instantly (which, I admit, I do when I've got my 400mm mounted) then you should already have a perfect device for protecting your lens which won't affect the performance in any way - unless you leave it in place, that is! The lens cap.
By keeping the lenshood extended on my 400mm at all times when I'm out, I've never had any problems with damage to the front element, though nirofo's comments on sea-spray need to be kept in mind.
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