This bag is great for fins, mask, snorkel but would be too small for a BC. On a trip recently, took this bag and had to walk long distances and this bag was perfect to keep my money, fins, mask, snorkel, etc. Just wish this bag had a pocket either inside or outside, to keep small things. Most of the bags are too large for a women to carry around all day (and I'm 5'8") but this size was perfect.