1. A TEXTILE ARTICLE COMPRISING TUBULAR FABRIC PORTIONS ALTERNATELY SEPARATED ALONG THE WARP DIRECTION BY: (A) STRIPS PARALLEL TO THE WEFT DIRECTION, SAID STRIPS CONSISTING OF SINGLE-LAYER FABRIC FORMED BY BRINGING TOGETHER AND COMBINING IN PARIS WVERY FRONT WARP END WITH A MATCHING BACK WARP END OF THE TUBULAR FABRIC PORTION AND WEAVING THE RESULTANT PAIR OF ENDS AS ONE; AND (B) COMPOSITE STRIPS PARALLEL TO THE WEFT DIRECTION, EACH OF SAID COMPOSITE STRIPS COMPRISING AT LEAST TWO SINGLE-LAYER FABRIC PORTIONS AND ONE DOUBLE-LAYER FABRIC PORTION, SAID (A) STRIPS AND SAID (B) STRIPS BEING SO DISPOSED THAT THE RATIO OF THE LENGTH ALONG THE WARP OF EACH TUBULAR FABRIC PORTION OT THE WIDTH ALONG THE WEFT OF SAID PORTION IS BETWEN 1.4 AND 2.2, AND THE RATIO OF THE RECTILINEAR SURFACE OF ANY TUBULAR FABRIC PORTION TO THE CONTAINABLE VOLUME THEREOF IS BETWEEN 2.3 AND 2.6 RECIPROCAL FEET; AND EACH SAID STRIP (A) AND (B) SPANS THE WEFT OF EACH TUBULAR FABRIC PORTION, EACH COMPOSITE STRIP CONSISTING OF AT LEAST ON COMPOSITE SEGMENT SPANNING THE WEFT OF ONE SAID TUBULAR FABRIC PORTION, EACH SUCH SEGMENT OF A COMPOSITE STRIP CONSISTING OF ONE SINGLELAYER FABRIC PORTION AT EACH END THEREOF AND ONE DOUBLE-LAYER FABRIC PORTION CENTRALLY THEREOF FORMING UPON SEVERANCE ALONG SUCH STRIPS A SACK WITH A MOUTH AT THE CENTER OF A NARROWER EDGE OR TOP OF THE SACK; SAID FABRIC BEING WOVEN FROM CONTINUOUS FILAMENT SYNTHETIC YARN AND HAVING A TRAPZEOIDAL TEAR STRENGTH ACROSS THE WARP DIRECTION OF AT LEAST 190 POUNDS AND ONE-INCH GRAB STRENGHT IN THE WARP DIRECTION OF AT LEAST 450 POUNDS; EACH SUCH TUBULAR FABRIC PORTION OF SAID ARTICLE HAVING CAPACITY FOR AT LEAST 80 POUNDS OF MOIST SAND.