I have a timbuk2 holder that goes right onto a shoulder strap of my backpack. All the gps stuff still runs with the screen off, and I can play music from it and hear it with out headphones. And it's easy to access when/if needed (only when at a complete stop of course, but also when not, so I hear) It's been one of my better random purchases, holds my cell plus credit card/insurance card/cash no issues.