The catalogue runs from a 666 g cream charger to a 10 kg N2O tank. The right size is a question of how much you get through in a week and how much room the bench has, not of which one is best.
A 666 g charger suits a kitchen running compatible dispensing equipment at ordinary volume: a small cafe, a bar that finishes a handful of drinks a night, a pastry bench working to order. It is the easiest size to store and the easiest to replace.
The 2 kg chargers sit in the middle and cover most working kitchens. A restaurant with a dessert section, a busy cafe, a catering team preparing off-site all tend to land here. Cream Deluxe, FastGas and Lachgas are all listed at this size, so the choice becomes a matter of the equipment you already run.
At 4.33 kg the assumption changes: this is for benches getting through cream and foams in quantity, where changing a smaller unit twice a service is the actual problem.
The 5 kg and 10 kg professional N2O tanks are for steady, high throughput. They need a compatible regulator and somewhere sensible to keep them, and they are worth it only when the volume is genuinely there.
Whichever size you pick, check it against the current manufacturer instructions for your regulator or siphon before ordering. Send us the model if you want that checked first.