I have the 'slinger and love it, though I can't speak on the others. If you're not looking for a bladder pack, you might also like Dakine's stuff, I've got several. I like the two straps on the front (meant for a skateboard) but I use them to either hold my sweatshirt, or to strap a battle mistress to my pack. They've got some great stuff. They all come with a fleece lined sunglasses pouch too. Keeps your shades safe
. My favorite pack is my Dakine with the wetsuit pouch...thing's clutch. I use one as a daypack as well. They've got some cool features and are comfortable, well made.