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Underwater lift bags

Versatile Lift Bags for Marine, Mining, Aquaculture, Construction, and More

Fleximake is a leading Australian manufacturer and supplier of inflatable underwater lift bags, delivering rugged, high-performance buoyancy solutions for a wide range of industries—including marine salvage, underwater construction, aquaculture, mining operations, boat and ship maintenance, equipment recovery, and offshore oil and gas platform maintenance activities.
Developed in close collaboration with divers, riggers, engineers, and salvage professionals, our lift bags are engineered for safety, durability, and precision control in the harshest underwater and near-surface environments.
We also offer fully custom lift bag solutions—including rectangular, pillow-style, and irregular-shape designs—to suit unique lifting and flotation challenges.

Underwater Inflatable Lift Bags

Built for Demanding Lifting Operations Across All Environments.

Fleximake’s lift bags are constructed from heavy-duty PVC-coated fabric, with reinforced seams and contact points to resist punctures, abrasion, and impact—whether used in saltwater, freshwater, mines tailing dams, or industrial reservoirs. Their compact, lightweight design allows for easy transportation, rapid deployment, and minimal storage footprint.

Industry-Proven Lift Bag Designs

Ideal for vertical lifting from the seabed or lakebed, and commonly used in deepwater salvage, aquaculture net installation, and equipment recovery in marine or industrial settings.

Key Features:

• Open-bottom droplet shape for unlimited depth lifting
• Passive auto-venting to prevent overexpansion during ascent
• Manual dump valve with pull-cord for controlled air release
• Inflation inlet with check valve (included for models ≥500kg lifting capacity)
• High-strength PVC coated fabric – Tear, abrasion, UV, and chemical resistant
• Welded seams – Durable and airtight under pressure
• 3/4” quarter turn Ball Valve for efficient inflation underwater (fitting can be customised)
• 1:6 safety factor slings exceeds industry standards
• Reinforced contact base for reliability and durability during heavy lifting

Functional Components:
Component Purpose
Dump Valve (Top) Manual air release via pull-cord for buoyancy control or emergency venting
Open Bottom Auto-vents excess air during ascent
Inflation Valve 3/4” quarter turn ball valve for safe inflation

Ideal For:
✔ Sunken equipment and ship recovery
✔ Subsea or underwater pipeline rigging
✔ Subsea or underwater cable rigging
✔ Subsea or underwater structure rigging
✔ Aquaculture net rigging
✔ Boat salvage or refloating
✔ Mine shaft water asset recovery
✔ Dive school training & commercial diving support

Model Specifications

Parachute Lift Bag Models – Opened Bottom
Model No. Buoyancy (kg) Dimensions (Dia × H, mm) Dump Valve Inflation Point
FPL 50 50 500 × 600 1 0
FPL 100 100 700 × 700 1 0
FPL 250 250 800 × 1150 1 0
FPL 500 500 1000 × 1450 1 0
FPL 1000 1,000 1250 × 2050 1 1
FPL 2000 2,000 1700 × 2450 1 2
FPL 3000 3,000 1700 × 3450 1 2
FPL 5000 5,000 2300 × 3600 1 2
FPL 10000 10,000 2500 × 4300 1 2

Perfect for surface flotation, tow support, and equipment lifting directly beneath the waterline across marine, inland, or industrial applications.

Key Features:
• Closed-end cylindrical design – Delivers maximum buoyancy and control
• Pressure relief valves – Prevent over-inflation and allow fast deflation
• 30% higher lift performance than standard rubber airbags
• Load-rated lifting straps – Compliant with Australian Standards
• Multiple rigging points – Ensure safe, stable lifting
• High-strength PVC coated fabric – Tear, abrasion, UV, and chemical resistant
• Welded seams – Durable and watertight under pressure
• Customisable shapes – Cylindrical, pillow, rectangular, or donut
• Reusable and compact when deflated – Easy to store and redeploy.

✅ Ideal For:
✔ Surface flotation of submerged equipment
✔ Flotation during net deployment in fish farming
✔ Load support in construction barge work
✔ Towing operations for sunken assets
✔ Supporting underwater pipelines or machinery

Model Specifications

Cylindrical Lift Bag Models – Closed-End
Model No. Buoyancy (kg) Dimensions (Dia × L, mm) Pressure Valves Inflation Points
FCL-250 250 600 × 1000 1 1
FCL-500 500 800 × 1000 1 1
FCL-1000 1,000 1050 × 1250 2 2
FCL-2000 2,000 1050 × 2450 3 2
FCL-3000 3,000 1250 × 2450 4 2
FCL-5000 5,000 1700 × 2650 5 2
FCL-10000 10,000 2300 × 2650 8 2
FCL-20000 20,000 2400 × 4500 15 2

Comparison Table: Parachute vs Cylindrical Lift Bags

Feature Cylindrical (Closed-Ended) Parachute (Opened-Bottom)
Best Working Depth Surface to 20m Unlimited depth
Lift Mechanism Enclosed buoyancy Water displacement
Rigging Multi-point shackles and slings Single-point lifting shackle
Standard Capacity Range 250kg – 20,000kg 50kg – 10,000kg
Portability Compact rollable design Lightweight & fast-deploy
Applications Surface flotation & near water lifting Deepwater lifting & salvage
Underwater Inflatable Lift Bags19
Underwater Inflatable Lift Bags20

Why Fleximake Is the Industry’s First Choice

  • Australian-Made & Engineered
  • Heavy-Duty Reinforced coated Fabric Construction
  • Customisable Sizes & Capacities – No Limits
  • Quick Deployment & Inflation Systems
  • Compact, Portable, and Cost-Efficient
Underwater Inflatable Lift Bags16
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Underwater Inflatable Lift Bags13
Underwater Inflatable Lift Bags12

Custom Designs to Suit Your Project

While our standard parachute and cylindrical lift bags meet most industry needs, Fleximake also designs and fabricates custom lift bags tailored to your application. This includes:
• Rectangular lift bags for uniform buoyancy under wide loads
• Pillow-style buoyancy bags for space-restricted or horizontal lifting operations
• Custom attachment points, rigging hardware, and valve configurations
• Specific material choices for chemical or extreme-temperature environments
No matter your size, shape, or load requirement—we can manufacture it.

Ready to Lift with Confidence?

Whether you’re recovering equipment from a flooded mine, refloating a fishing vessel, or supporting aquaculture structures—Fleximake’s inflatable lift bags provide the buoyancy control and strength you need.

Our team will help you design the perfect lift bag system for your job.

Enquire

Send us Your Enquiry

Let’s Discuss Your Needs.

Underwater Inflatable Lift Bags
Underwater Inflatable Lift Bags3