The quick-connectors we use on our M1a and M1w straps are Op/Tech USA Mini QD Loops™ (They come in 1mm and 1.5mm versions, but we only use the stronger 1.5mm version).
We’re often asked if they release accidentally. We’re happy to report, we’ve never seen or heard of this happening. To release them, you have to apply significant pressure to both sides — simultaneously. It’s virtually impossible for them to release unintentionally.
We’ve found them to be small, strong (check out our strength test) and reliable, but don’t just take our word for it — They have a 4.6 rating on Amazon with 250+ reviews.
If you’d like to use your M1 Series strap on more than one camera, or just want some spares, we sell them here.