I have the Tail & Saddlebag combo and I really like them too. The rain covers have worked pretty well but I just recently had a little water get into the Saddlebags. In fairness, it was 20 miles through about the worst storm I’ve ever ridden in (thunder, lightning, torrential rain, well flooded roads, 40-50 MPH wind gusts).
I use the Tail-Bag bungee cords and the straps which is very secure. I wouldn’t count on just the Tail-Bag’s bungees, especially with anything of substantial weight and/or value in it.
At 5’9” x 30” I can swing my leg cleanly over it by using the `kick your ass with your heel while swinging knee over the seat’ method.
~~ Live Like You're Dying ~~