13/05/2026
Sidemount or backmount? The honest answer isn’t about which looks cooler — it’s about where each system takes you.
What matters most when choosing:
🔹 In-water balance. A manifolded twinset is inherently balanced — both cylinders share one gas supply. Sidemount while excellent at putting you in the right trim requires active gas management to maintain balance throughout the dive.
🔹 Progression from single-tank DIR. If you’ve trained in a single-tank DIR setup — backplate and wing, long hose, bungeed backup — backmount doubles scale up directly from what you already know. Hose routing, procedures, and muscle memory carry forward. The valve drill is the main new skill. Sidemount is a different system to learn from the ground up and will require you get some recreational dives to build muscle memory in before you can safely conduct tec dives.
🔹 Scalability to deeper dives. This is what most divers underestimate. As dives get deeper, you add additional stages like travel gas and deco cylinders. A backmount diver clips them along the body — the natural carrying real estate. A sidemount diver has already used that space for their back gas, with the back left unutilised. More than 4 cylinders on a sidemount diver introduces real complexity. Backmount simply scales better into deep trimix and multi-stage deco especially when diving beyond 65m
🔹 Team standardization. Backmount is configured consistently across the tec community. Sidemount setups vary diver to diver though organizations are bringing in this standardization to reduce inconsistencies
🔹 Specialized environments. Sidemount remains essential for tight passages where backmount cannot fit, & a practical choice for divers managing physical limitations like back problems.
🔹 Carrying & filling. A twinset is heavy — simpler on a boat, harder on shore. Sidemount cylinders are carried and filled one at a time.
The bottom line.
👉Choose Sidemount if your diving takes you into tight overhead environments overhead environments or if physical limitations like back issues.
👉Choose Backmount if you’re building towards deeper dives or team based diving where standardization matters.
