This word is not acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. As much as a container can hold.

n. the quantity that a container will hold.

n. the quantity that a container will hold

"I considered the relative risk, gritted my teeth at the price tag, and loaded a containerful into my bag."

indefinite quantity   

cup    flask    pitcher    cartonful    mugful    teaspoon    pot    hatful    teaspoonful    jarful