Hi,
We have a 4.5kg fitted and carry a 2kg as spare. A smaller one would be more convenient as it is only used for a few days between swapping or refilling the 4.5kg.
We can, if needed, refill the 2kg from a swap 4.5kg and return it after topping off the fitted 4.5kg but have never needed to do that.
Yes, I know it is not strictly kosher, but precautions would be taken if it was ever needed.
Cheers
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