Underwater Lifting Bags

MatJack underwater lifting bags were introduced back in 2004. Underwater lift bags come in lots of shapes and configurations to meet all your floatation needs whether it is in shallow streams or ocean depths.

The open bottom cushions fill from the top and displace water out of the bottom until either the submerged vessel begins to float to the surface or the bag fills and the relief valves open. These are used the best in water deeper than 20 ft/ 6m because of their general configuration and need more room to operate. Open bottom bags can also lose air due to rocking back and forth while on the surface when in rough water, known as “burping”.

Retrieving anything submerged with this style bag has to be done in a manner allowing for quick hook up to recovery equipment located on a solid foundation when the submerged vessel breaks the surface of the water to limit the chance of losing the recovery due to the bag “burping”. The biggest advantage of the open bottom cushions is the ability to build very large recovery cushions with lower costs providing for a more cost effective cushion when dealing with greater lift capacity cushions.

The enclosed pillow style cushion offers a less volatile cushion due to the air being trapped inside so it only vents when either the relief valves open or divers pull on the ropes attached at the relief valves to open them manually. Many sizes are available covering a wide range of lift capacities. These are ideal for recovering vessels in shallow water such as lakes and rivers and function well as boat lift air bags.

The boulder bags for very shallow water, salvage tubes for long sided hulls or similar, propeller bags and personal floats are all used more for specific type recoveries and need to be discussed with one of our staff for proper application. These specialized options expand the uses of lifting bags underwater and can also serve as lift bags for boats depending on the situation.

Types of Underwater Lift Bags Offered by Matjack

Matjack offers several underwater lift bag styles for different lifting scenarios.

• Open Bottom Lift Bags allow fast ascent with controlled venting, ideal for deeper applications.
• Enclosed Pillow Bags provide full inflation and precise buoyancy control, making them well-suited for shallower water.
• Boulder Bags support rock or object movement at minimal depths.
• Salvage Tubes feature a long, cylindrical shape for stabilizing submerged vessels.
• Propeller and Marker Buoy Bags assist with lift and identification in marine operations.

These lifting bags are built to handle demanding underwater conditions while supporting safe lifting practices.

Selecting the right underwater lift bag depends on object weight, water depth, available rigging points, and lifting orientation. Open bottom and pillow-style bags serve different lifting needs, and the team can assist with product selection based on your operation.

Applications of Boat Lift Air Bags

Boat lift air bags are used for vessel salvage, sunken equipment recovery, and support during underwater construction. They help refloat boats, vehicles, and other heavy objects. Divers and marine contractors also use them for pipeline work, artifact retrieval, and buoyancy assistance. Lift bags for boats allow gradual or full recovery depending on the object’s weight and depth.

Technical Features, Benefits, and Specifications

Matjack’s lifting bags underwater are made with high-strength materials and include essential features for diver control and safety. Overpressure valves prevent accidental rupture, and dump valves allow controlled descent. Bags include multiple anchor points for secure lifting and easy positioning. Lift capacities range from 25 lbs to over 12,000 lbs, covering both light and heavy recovery tasks. Bags are compact when deflated, simplifying transport and storage.

Industries Served

Underwater lift bags are used by commercial divers, marine contractors, salvage teams, and public safety agencies. Whether lifting boats, rocks, or equipment, these tools support underwater work across many operations.

Why Choose Matjack for Underwater Lift Bags

Matjack is trusted by professionals for durable equipment, responsive support, and proven results in underwater recovery. All lift bags are made in the USA and built for real-world performance.

For product questions, recommendations, or pricing, contact us today. Technical specifications and catalogs are available on request.

View Our Catalog for Underwater Bags