Looks like the Klymit is a good replacement for the discontinued
Halcyon Diver's Life Raft.
My Halcyon Diver's Life Raft, carefully folded (not rolled) into its
optional pouch (available separately, or find a less expensive nylon/canvas zipper pouch with minimum dimensions 10"L x 8"W x 2"Thick ), butt mounted to the bottom edge of the Backplate with bungee/shock cord (there's no freakin' way to stuff all that cleanly into the Halcyon Backplate MC Pouch!) and clipped-off to the rear D-ring of the crotch strap.
Again the life raft is a good survival tool to ward off immersion hypothermia and get you out of the water; invaluable for remote tropical dive sites with strong currents and the potential hazard of drifting away unseen on the surface from the diveboat. . .
Still have mine at nearly ten years old; only deployed it for real as a huge surface buoy to signal a Liveaboard about half a mile away to send a skiff for pick-up as my group was being carried away by current (Sulu Sea/Tubbataha Reef Philippines).
For a 2010 Wreck Expedition to the WWII
Aircraft Carrier HMS Hermes off of east coast Sri Lanka, along with a
PLB (satellite tracked Personal Locater Beacon),, I brought the Halcyon Diver's Life Raft and a Deep Sea Supply Hydration Pack:
DeepSeaSupply - Product Detail
We did a lot of drifting deco diving, and if the dive skiff lost sight of your SMB --you were essentially adrift in the Indian Ocean, next land mass West being Madagascar some 3000 miles away. . .