The 48 liter buoyancy bags are slightly heavier than the 43 liter buoyancy bags, but after a capsize, there is much less water in the boat. Locking tube valve. Blue color, inflated size 29 cm x 92 cm, content: 48 liter. Deflated size 44 cm x 98 cm, radius 5 cm. Please note, so as not to inflate the Optimist buoyancy bags too much. When the bags are properly filled, they will be soft to the touch. Over-inflated buoyancy bags can burst when heated by the sun or rising temperatures. Make sure there are no sharp points in your boat that could catch or puncture the buoyancy bags.