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Size-wise these jars would be considered to be small as they are 3.9 inches square at the base by 4.3 inches in height.
They already have the labels incorporated which is convenient as no extra work is needed to add your own labels, and saves opening them up each time hoping to get the right container.
As they are made from stainless steel and coloured with a black coating they will not rust. When compared to glass or ceramic these containers are much lighter to handle. If there are young children in the home then this might be a feature worth considering.
For more ideas for beverage jars look at this SELECTION OF 10 HERE