Switlik's OPR (Offshore Passage 'Life' Raft) is designed to be a high quality, light weight, modern version of the offshore life raft, with a convertible canopy system, Toroidal Stability Device and heat sealed construction. The OPR provides 1,350 lbs. of inflated buoyancy and 24 sq. ft. of floor area and offers excellent ventilation as well as total protection from the elements.
Torodial Stability Device (TSD)Switlik Offshore Passage Life Raft Manual (.pdf)

The OPR comes standard with four (4) high-capacity rapidly deploying weight ballast bags. The water pockets provide weight to the raft to keep it stable during entry and exit. The OPR is also upgradable to the full wrap around Torodial Stability Device (TSD). The Switlik TSD provides superior stability and has been proven by the USCG, the RAAF as well as other SAR Organizations worldwide, to be the best option for keeping a raft stable and upright during all conditions including the helicopter.