The basic types of lifting bags are:

The basic types of lifting bags are:

• A. High, medium, and low pressure
• B. Lift, squeeze, and patch bags
• C. Large, medium, and small bags
• D. Air, inert gases, and hydraulic pressure

Answer: (A)

Lifting bags are categorized by how much pressure they use to inflate, because pressure dictates both how much lift you get and how quickly the bag can rise. High-pressure bags inflate quickly and produce strong lift in tight spaces, which is handy when you need fast, decisive movement but must be used with careful setup to maintain stability. Low-pressure bags require more inflation volume and time, but they spread the load over a larger surface and tend to be more forgiving on uneven contact, which is useful for heavier lifts where surface area matters. Medium-pressure bags fall in between, offering a balance of lift capacity and speed for a wide range of situations. The basic classification based on pressure—high, medium, and low—best reflects how these bags are used in practice, rather than size distinctions, bag functions like lifting versus patching, or gas type.

Lifting bags are categorized by how much pressure they use to inflate, because pressure dictates both how much lift you get and how quickly the bag can rise. High-pressure bags inflate quickly and produce strong lift in tight spaces, which is handy when you need fast, decisive movement but must be used with careful setup to maintain stability. Low-pressure bags require more inflation volume and time, but they spread the load over a larger surface and tend to be more forgiving on uneven contact, which is useful for heavier lifts where surface area matters. Medium-pressure bags fall in between, offering a balance of lift capacity and speed for a wide range of situations. The basic classification based on pressure—high, medium, and low—best reflects how these bags are used in practice, rather than size distinctions, bag functions like lifting versus patching, or gas type.