How do you change out and where? How many bottles can you go? How long do they last?
Air Packs and everything that surrounds them. What type of pack do you prefer? What size bottle do you prefer and why? Do you like the quick connect bottles? Do you like the buddy breathing attachment? There is so much available these days and we should question what makes sense and what does not.
Do you mask up every morning when getting on-duty? Do you check your heads up display? How low before you top off? When is it worth it to top off? Do you pre-connect mask?