Sentence:  Emerson - Platonist , idealist , doctrinaire - sounded a high Transcendental note in his `` Boston Hymn '' , delivered in 1863 in the Boston Music Hall amidst thundering applause : `` Pay ransom to the owner and fill the <WSD>bag</WSD> to the brim . 
Meaning of the word marked with <WSD> tags:  a flexible container with a single opening