BlackRapids is the... devil of sling companies. Bogus patents and filing garbage suits against start ups to prevent competition. I won't give them any money. Not a penny.
I use a CarrySmart cross body strap. It's hands down the best strap I've ever bought. FS-Pro with a tripod mount.
Here is a Link to it:
http://www.ebay.com/itm/New-2015-Ca...-Shoulder-Strap-for-DSLR-Camera-/201134267857
*** I can't vouch for this seller, it's the first one to turn up on a quick google search.
I've been using mine since 2012. I can carry my Canon T4i with a 18-135mm STM II lens 12 hours in the park and it's still a joy to carry. Also, the way it works with the stops, you can "sling it" on your side and it stays in place, the physical motion of raising it up releases the slider but walking, leaning over won't release it. It's genius.
For bags, I've tried several. A cross body bag like a messenger style which is good for shorter trips but a 12 hour park day can get tiresome on back to back days. I've used a Kata 3n1 bag the medium size, which is really nice but the padding on the straps can take it's toll after 3-4 12hour days. I also have a Manfroto back pack made specifically for DSLR's that is a big of a combo deal. Pretty cool back pack you can use with one shoulder if you want to.
Yeah, I have a lot bags, lol. I usually travel with either the manfroto and the cross body messenger or the Kata and cross body.
Anyway, with the photopass for our passes and the newer cameras on our Galaxy S7's, I find myself only bringing a DSLR into the parks on "special" days. Unlike 2012. 2013 and 2014 where I brought it every single day.