Mostly a left shoulder sling
If Pacsafe made a smaller 8L - 10L version with at least 1 bottle pocket, then I'd get it immediately despite my issues with the 12L.
1. The switchable shoulder strap experience wasn't fully thought out. When you put the strap on your right shoulder and swing it to the front, the locked zippers for both compartments are awkwardly away from you. Pacsafe could have used their "self-locking zippers" instead so the zippers could be locked on either side. The current setup effectively makes it a left shoulder sling for me.
2. I'd like the tablet sleeve to be padded to protect my tablet from other items. I'd never use it for a water bladder (a leaky disaster waiting to happen) so I'm glad there are external water bottle pockets (a rare but very appreciated feature on slings).
3. I got the black version to be less noticeable so I'd like the turquoise zipper pulls and accents to also be black instead.
4. There could be more internal organization. It's mostly 2 big dump pockets so you dig for your stuff depending how much you're packing.
I know these issues are mostly known before buying but these are changes I'd like for the next version. Anyway, it's a decent backpack style sling with good theft deterrent features.