Purchase. Virtually every BCD on the market has these features, so besides fit and comfort, you'll buy your BCD based on other features. Try to choose a BCD that's as streamlined as possible. Other desirable features include a utility pocket, a whistle for surface communication, hose retainers and utility rings for attaching accessory equipment. Many scuba divers like BCDs that include a weight system, which eliminates a separate weight belt (more about weight systems in Section 2). Your Bali scuba dive center, resort or instructor can help you find an appropriate one.

Materils. Modern BCDs come in either doublebladder (or "bag") or single-bladder designs. The single-bladder design is usually ma-de from a coated fabric that serves to both hold air and resist cuts, punctures and abrasions. Doublebladder BCDs consist of an inner bladder (usually made of urethane plastic), which holds the air, and an outer nylon shell that protects the inner bladder from cuts, punctures and abrasions. Single bladder types have become the most common.

Prepation For Use. BCDs require adjustment for a proper fit. If it's too loose, it rotates awkwardly around you, and if it's too tight, it can restrict breathing, especially when you inflate it. Fortunately, most modern BCDs adjust easily - you can usually tighten or loosen them (to a degree) without taking them off.

With the BCD deflated, estimate the adjustment of the straps, lengthening or shortening them as needed. Next, put it on (have someone help you if necessary) and fine-tune the adjustments until it fits snugly, yet comfortably. Finally, inflate the BCD. Even fully inflated, it shouldn't feel restrictive. Your instructor will help you adjust your BCD during your confined water Bali scuba dives.