A registrationsearch method for structured documents where correspondence data is prepared between a fixed-length-string and a string occurrence position within a structured document for all fixed-length-strings in the document and for each structured document. When temporarily halting drinking, the consumer can insert the two ends of the bent drinking tube into the two straw holes for closing the container, therefore preventing contamination of ends of the drinking tube, and leaking of the liquid. A first support member has a larger rate of deformation due to at least one of heat and humidity than a second support member.