Geez folks, you don't have to be anyone's fan boy or otherwise to have some grasp of how the retail (or any) supply chain works, and how it can be compromised. People that funnel counterfit goods into the supply chain are often quite adept at their craft - some criminals are smooth and smart, those in jail, not so much. The most proficient criminals walk the street, attend church with you, sit near you in the resturant, live down the street, they haven't been caught! It could also be a "in house" criminal somewhere in the line, a bad "Buyer" or contract administrator, bad warehouse manager, bad inspector, almost anyone could be on the take, and do things with product. It takes a little time, but they usually are found out.

You know most if not all of these battery sources are in Asia, the old switcharoo or phony insertion could be played almost anywhere along the line, and that is a long line, long process.

If you are receiving shipping containers full of the product, it would be easy to miss a counterfit case/cases if placed in among the real deal. How many individual inspections (battery by battery) happen when receiving 10,000-20,000 batteries, few, very few. The cases are shipped to the retailers (usually un-opened), it is not until they are opened and product is put on the shelf or in the bin that things are viewed on an individual basis, or closer inspection occurs.

Just about every large firm, retailer, our own government, military, NASA, have all been stung by counterfit goods. Imagine container ship loads to foreign ports, hundreds of containers, loaded with tons of product, ample opportunity for fraud, theft, etc. etc.

Hopefully we may hear the whole story at some point, two large, prominent companies with excellent reputations; I don't see them purposefully comitting fraud - it takes a very long time to recover from that kind of black eye. Even in this time of "short memories".

My advise: Get two. One that is large enough for two bodies and about 4 lenses and a speedlight and a holder for a sturdy tripod. The other one should be small enough for one body, two lenses, a speedlight and straps for a small travel tripod. I have backpacks that when fully loaded will weigh close to 30 lbs. and that is no fun to walk around with all day. The other backpack I use with limited gear weighs only around 12 lbs. and is much more comfortable to handle. When loading your backpack, think carefully about what you will be photographing and don't take gear you will not be using. Backpacks are great tools but you can really make a nice photo outing miserable by hauling too much gear.