MDW - 3/26/2019 3:43 PM
He was asking about yellow vs orange (black was not one of the options in his question) for use below 30’ (not at the surface). My point is that there should be little difference between yellow or orange and it may be a moot point since the visibility of the bag at depth should not be much of a concern.

You’re right, though, a black bag would not be easily seen at the surface. Also, at the surface (depending on who your surface support is) there may be a difference in meaning between the meaning of an orange bag vs a yellow one. Some people regard one color as "normal" and the other as a distress signal. When sending things up unaccompanied, be sure to agree with your friends on the surface that color does (or not) mean something in particular.