I like my 40 because it fits nicely on my lap in the car. However, I think the strap of the Keepall is definitely worth it. Also, the Keepall 45 has those two straps of leather running down the side of the bag, giving the bag extra support, so you can carry more weight. I have two Keepall 45s and a Speedy 40. I use the Keepalls way more. I am selling the Speedy 40 to a friend. You could check out the Speedy B!