When it comes to choosing the right size pony bottle, there are a few factors to consider. A pony bottle, also known as a bailout bottle or a redundant air source, is a small cylinder of compressed air that divers carry as a backup in case their primary air supply fails. The size of the pony bottle will depend on your diving needs and preferences.
One of the most common sizes for a pony bottle is around 19 cubic feet (cft). This size provides a good balance between portability and the amount of air it contains. It is compact enough to carry comfortably, yet it holds enough air to give you an adequate backup supply in case of an emergency.
A smaller pony bottle, such as a 13 cft, may be tempting due to its compact size and lighter weight. However, it may not provide enough air to sustain you for an extended period of time. It could be sufficient for a quick ascent to the surface in shallow waters, but if you are diving deeper or have a longer decompression obligation, a larger pony bottle would be more appropriate.
On the other hand, if you opt for a pony bottle larger than 19 cft, you may be entering the realm of a stage bottle. A stage bottle is a separate cylinder of air that is used for extended dives or decompression stops. These are typically larger than pony bottles and are not meant to be carried as a backup air source. If you find yourself needing more air than what a 19 cft pony bottle can provide, it may be worth considering a stage bottle instead.
It’s important to evaluate why you feel the need to carry redundant air. Are you diving in remote locations with limited access to emergency assistance? Do you have a higher risk tolerance or engage in more technical diving? Understanding your specific diving circumstances and comfort level will help guide your decision on pony bottle size.
Additionally, it’s worth noting that carrying a pony bottle comes with added responsibilities. You’ll need to ensure it is properly filled, regularly inspected, and securely attached to your dive gear. It’s also important to practice using it in a controlled environment, such as during a dive course or training session, to familiarize yourself with the procedures for switching to your backup air supply.
A 19 cft pony bottle is a versatile size that strikes a balance between portability and providing a sufficient backup air supply. However, the right size for you will depend on your specific diving needs, preferences, and risk tolerance. Consider factors such as depth, dive duration, and access to emergency assistance when making your decision.