The amount that a bag can hold; as much as a single bag will contain.
From 'bag' (container) + '-ful' (suffix meaning 'enough to fill'). Old English 'bagga' + Germanic root, with '-ful' from Old English 'fullian.' Standard noun-forming construction used for cupful, spoonful, handful, etc.
English's '-ful' suffix tells us something profound: we measure not by standard units but by 'what containers hold'—a bagful, cupful, or handful. This shows our ancestors measured in practical objects, not abstract numbers!
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