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.
 100 Urethane Paintball HPA Tank O Rings O Rings oring  US $4.25
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 Two 20oz co2 paintball tanks and four pods US $16.00
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 100 Paintball CO2 HPA Tank O Rings O Rings oring kit US $4.25
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 Carleton Paintball CARBON FIBER N2 Tank 48 4500 US $55.00
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 Carleton Paintball CARBON FIBER N2 Tank 68 4500 US $60.00
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 NEW PAINTBALL 3000 psi AIR TANK Regulator US $15.99
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 Scuba Fill Station Paintball HPA tank fill Adapter Blk US $13.95
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 Scuba Fill Station Paintball HPA tank fill Adapter Blue US $16.95
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 20 oz co0 tank for paintball gun US $15.06
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 NEW PAINTBALL 4500 psi AIR TANK Regulator US $15.99
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 paintball tank 68 4500 tank US $165.00
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 3000 PSI COMPRESSED AIR TANK PAINTBALL 48CU KINGMAN 2 US $34.99
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 Ninja 48ci 3000 psi Alum HPA Tank Paintball NEW NR US $39.99
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 9oz c02 paintball tank US $10.00
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 68 cu in 4500 PSI Stratos Carbon Fiber Paintball Tank US $100.00
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