I'm looking into getting a mono speedy 25. For those of you who already own speedy 25, i have some questions I'd like to ask. 1. does the zipper scratch your hand/wrist as you reach in to put things in/out? 2. is the zipper smooth? does it get hard to zip as it gets older? 3. is the interior leather lined? canvas? does it get sticky as time passes? Appreciate your input. Thanks.