Halcyon Double Cylinder BC System (Stainless Steel Backplate) | Legend™ MK2

Built for the Depths. Engineered for Stability.

Halcyon helped shape technical diving from the start, beginning with twin cylinders. As pioneers of backmount systems, the Halcyon Double Cylinder BC System (Stainless Steel) is the ultimate twin-set platform for technical divers pushing boundaries—whether you're in a complex cave system or exploring deep historic wrecks. Designed for optimal balance and trim, this system provides rugged durability with refined comfort. The stainless steel backplate inherently provides ideal negative ballast, significantly reducing the need for ditchable lead weight and refining your underwater trim, making it perfect for cold water or drysuit diving.

Featuring the Legend™ MK2 Wing & Configurable Harness

This system comes exclusively equipped with the advanced Legend™ MK2 Wing, engineered for precision trim, integrated hose routing, and unmatched accessory control. Paired with a CNC-machined, high-grade 304 Stainless Steel backplate, you can tailor your rig to your exact diving style by choosing between the minimalist, ultra-rugged Standard Harness or the highly adaptable Deluxe Cinch™ System. This modular setup offers absolute readiness right out of the Halcyon Traverse bag.

⚙️ Technical Specifications

• Wing: Halcyon Legend™ MK2 – Advanced routing, Opti-Weight pockets, and accessory control (Available in 40 lb / 18 kg or 60 lb / 27 kg lift capacities).
• Backplate Material: Constructed from high-grade, polished 304 stainless steel. Carefully milled surfaces eliminate all sharp edges to protect webbing. Utility holes allow mating with the MC Storage Pak and small Halcyon drysuit inflation kits.
• Backplate Sizes & Weights:
  • Small: 1.83 kg / 4.05 lb (Dimensions: 23.11 cm x 35.56 cm / 9.10 in x 14 in)
  • Standard: 2.22 kg / 4.9 lb (Dimensions: 26 cm x 39.3 cm / 10.25 in x 15.5 in)
  • Long: 2.52 kg / 5.57 lb (Dimensions: 26.67 cm x 45 cm / 10.5 in x 17.75 in)
• Harness Configuration Options:
  • Standard: Classic, continuous webbing harness for a minimalist and bulletproof setup.
  • Deluxe (Cinch™): Incorporates the Cinch™ Quick-Adjust system for instantaneous, tool-free fine-tuning, complete with deluxe shoulder and backplate padding.
• Included: MC Storage Pack, LP inflator hose (56 cm / 22 in), and a Halcyon Traverse Bag for easy transport.
• Optional Upgrades: ACB10 weight pockets (4 kg / 10 lb capacity) and trim weight pockets.