Dust-Off
Small cans
Disposable Duster, 3.5 oz
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$21.91$6.26 an ounce of gas
A compact can that tucks into a bag or shallow drawer, ready for quick passes across lenses, keycaps and small hobby pieces.
On the shelf
Small cans
Cans at 3.5, 5 and 7 oz, sized for a camera pouch, a laptop sleeve or the tray of a toolbox.
Made to travel
The small cans are the ones that ride along. A 3.5 oz can drops into a shoulder bag beside a lens, and a 7 oz can sits in a tool tray without claiming the whole compartment.
The same stream, less of it
Nothing about the gas or the trigger changes with the size. A small can does what the standard can does and runs out sooner, which is the whole trade.
Sizes that fit real gaps
Three sizes rather than one, because a padded camera insert, a laptop sleeve pocket and a drawer divider are three different gaps. We fill cans to suit the gap people actually have.
The camera bag case
Sand and grit around a zoom barrel is the argument for carrying a can rather than owning one. Grit that gets brushed along a focus ring works into the threads. Grit that gets blown off the barrel before the camera goes back in the bag never gets the chance.
That is a job for the smallest can we make. It goes where the camera goes, and the point is that it is there, not that it lasts.
What you give up
Small cans cost more per ounce than the 10 oz can, and there is no way around that: the valve, the trigger and the tin cost roughly the same whatever goes in them. You are paying for the size of the package, not the gas.
So keep a small can for the bag and a standard can for the desk. Buying the small size to clean a desktop tower is the one use we would talk you out of.