This package puts together a complete primary-and-backup regulator setup: your choice of Scubapro first stage (MK17 EVO2/C370, MK11 EVO/C370, or MK11 EVO/S270), the R105 octopus as your backup, and the Definition Reg 10 bag to carry both. If you pick the MK17 EVO2/C370, you’re getting a balanced diaphragm first stage with an environmentally sealed design that helps keep silt, sand, and cold water from affecting performance, built from chrome-plated brass and paired with the C370 second stage. The C370 uses a balanced valve and a reinforced technopolymer casing to keep breathing smooth and the unit light, with 2 HP and 4 LP ports for routing your hoses the way you want. It’s rated for nitrox mixes up to 40% oxygen and built to work across warm, temperate, and cold water.
The Scubapro R105 Octopus rides along as your backup regulator, using a classic downstream valve in a balanced second stage for steady, predictable airflow. Its metal valve housing is built for cold-water use, and a dive/pre-dive switch helps prevent freeflows when it’s not in your mouth. The 39-inch hose and high-visibility yellow faceplate make it easy for you or a buddy to find in a hurry, and the hose attachment is reversible so you can route it for either hand. At 0.8 lb, it’s compact enough to tuck into a travel or sidemount setup without adding much bulk.
The Definition Reg 10 Bag is where both regulators live between dives. Its U-shaped opening gives you full access to what’s inside, and a rain-proof YKK zipper with double sliders keeps things closed up during transport. Inside you get a front zippered pocket and a mesh pocket for small parts, plus an adjustable, removable shoulder strap and a top handle for carrying it your way. It’s sized for 10 L of gear, weighs about 0.82 lb, and has a webbing sleeve so it can ride on top of a roller bag. Between the regulator you choose, the R105 backup, and this bag, you’ve got a matched setup ready to pack and go.
