So I've never been a bag guy. But I threw one of these on (shameless plug) and I have to say it's a lot more invisible than I thought it would be. If you need a bit of gear and don't want a huge bag this thing is good.
Signature BB Handlebar Bag - 4 L
Arkel Ideal travel buddy / Waterproof / Shoulder strap to hit the streets / Grab snacks while riding / Install it effortlessly, no tool necessary / Ethically made in Canada.
www.arkel-od.com