I have to say that the postage plus exchange rate make this a ridiculous offer to anyone here in Australia. I can go into a Camera store in the city where I live and pay $86 Australian for the Slide strap (The DSLR one, not the cheaper Mirrorless camera item). This converts to around $61 US. The Massdrop offer at the moment is $50.95 plus $32 shipping which converts to $114 Australian! Shipping on its own is $44 Australian. As an aside, I bought the Everyday messenger bag direct from Peak with a 10% discount and it was sent postage free from their base in Hong Kong! I know Massdrop aren't responsible for the exchange rate but I'm sure they could make the shipping charge a bit more palatable to customers not in the US.
My 2c worth.