A printing fluid dispenser including: a deformable container containing a full complement of printing fluid; a housing including a base slidingly engaging a plunger and locating the deformable container; and an outlet coupled to the deformable container and arranged to convey the printing fluid to a point external to the housing; wherein the first and second portions include mated features arranged to prevent motion of said portions relative to each other until a predetermined level of operative force is applied across said portions.
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