In paintball you can find two different types of paintball tanks. Each type takes a certain type of air, and in turn can be pressurized at greater PSI's (pound per square inch).
Co2 Paintball Tanks - Co2 is one of the most abundant gasses in the world, and duly is the easiest to find. You won't have a hard time refilling a co2 paintball tank, which is one of the biggest reasons why players stick to co2. These tanks can come in 9oz to 20oz sizes, and are often made of steel or aluminum.
HPA Paintball Tanks - HPA stands for high pressure air, which includes nitrogen and compressed air. Air compressors are used to fill HPA tanks. HPA tanks are generally made out of carbon fiber, which is a light but durable material able to handle the high pressure. These paintball tanks are much more expensive.
 CustomAuto Cocker Paintball Marker 3000 PSI TankExtras  US $99.00
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 Empire Fuel Compressed Air Paintball Tank US $55.00
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 PMI Paintball Ultra 70ci 4500psi Tank Reactor II Black US $159.95
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 48 3000 Aluminum HPA Nitrogen Paintball Tank Twin Pack US $99.99
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 Spyder paintball gun with 20 oz air tank with hopper US $100.00
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 100 PAINTBALL CO2 HPA TANK O RINGS 90 DURO FREE SHIP US $5.49
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 200 PAINTBALL CO2 HPA TANK O RINGS 90 DURO FREE SHIP US $7.99
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 16 ounce CO2 tank for paintball marker US $7.00
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 co2 20oz paintball tank 20 oz bottle FIVE 5 NEW US $45.00
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 co2 20oz PAINTBALL tank co2 20 oz bottle THREE 3 NEW US $28.45
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 co2 20oz paintball tank co2 20 oz paintball bottle NEW US $9.50
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 co2 9oz paintball tank co2 9 oz paintball bottle NEW US $6.45
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 co2 9oz paintball tank co2 9oz bottle FIVE 5 NEW US $34.95
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 co2 9oz paintball tank co2 9oz bottle THREE 3 NEW US $14.95
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 co2 12oz paintball tank 12 oz co2 bottles THREE NEW US $21.95
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