CO2 Tank Sizes: 5 lb vs 10 vs 20 vs 50
Pick a cylinder size that fits your space and how often you want to refill. This is the “buy once, stop thinking about it” guide.
Quick decision rule
If you want the simplest recommendation: 20 lb is the most common “value” size for many home setups if you have the space. If space is tight, go 10 lb. If you’re mobile or just testing the waters, go 5 lb. If you’re refilling constantly (or running a shop), go 50 lb.
- Space: if you can’t store it upright securely, size down.
- Trips: if you hate refills/exchanges, size up (20 or 50).
- Carry weight: if you’ll move it often, 5 or 10 is your friend.
Fast picks
“Most people won’t regret it” defaults.
Size by size: what each feels like
5 lb
- Easy to carry and store.
- Great starter size for testing the waters.
- Downside: frequent refills if you use it daily.
10 lb
- Compact “sweet spot” for many home setups.
- Less annoying than 5 lb without being bulky.
- Great if space is limited but you want convenience.
20 lb
- Most common value size and widely supported for exchange.
- Fewer trips, good for multi-use setups.
- Downside: heavier, needs secure upright storage.
50 lb
- For heavy use: shops, events, big systems.
- Fewest trips, usually best economics.
- Downside: bulky and heavy. Not a casual cylinder.
Two things people forget
Secure the cylinder
Any size becomes a problem if it tips. A strap/mount is cheap insurance, especially 20 lb+.
Confirm refill vs exchange policy
Some suppliers only exchange. Some won’t refill customer-owned cylinders. Confirm before buying a tank expecting refills.
Optional gear (helps a lot)
Not required. Just common upgrades people end up buying.
Disclosure: some links may be affiliate links. Your price doesn’t change. Disclosure.
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