I had a $20 gift cert from REI that I used to buy the highly-rated Evoc saddle bag. To my disappointment, the rear light strap is angled such that my rear light points downward at roughly 30 degrees. I'm not planning on riding the bike the bag is strapped to in very dark conditions or tons of traffic. Should I still be concerned and get a different bag? If so, are there ones about the same price/weight/volume that I should consider? I have a medium Topeak aero wedge pack on a different bike that is too big and also curves downward such that I don't actually get to use the entire volume, and I barely fit what I need to in the 0.7L Evoc, ruling out the small sized aero wedge that has a 0.66L capacity.