the bag of the invention presents a new structure based on obtaining the packing , transportation and un - packing of a back rest and other objects with maximum efficiency . with this reason , the bag is designed to unfold into a piece of fabric which covers the bag rest attached to it , and , at the same time , the ground . to complement the description and with the objective of providing a better comprehension of the characteristics of the invention , a set of drawings accompany the descriptive report , which should aid in understanding of the innovations and advantages of the bag , object of the invention . the sizes and materials mentioned are based on one model of the bag , which will have variations . the concept will always be the same in respect to the design . fig1 . shows a view of the bag when closed , on the side where the back of the backrest is sewn on the inside . fig2 . shows a view of the bag when closed , on the side which has a pocket superimposed . fig3 . shows the bag when open with the folded back rest sewn to the fabric of the bag . fig4 . shows the bag when opened , with the backrest assembled , forming the triangle of the backrest , seen from behind . as seen in the commentated drawings , the bag consists of a piece of fabric ( 1 ) folded in half to form a bag , closed on the botton to the top of one side by a zipper ( 2 ). the bag has a strap ( 3 ) and a snap ( 4 ). superimposed on one side of the bag , there is a pocket ( 9 ). inside of the bag , are three wood structures ( 6 ), ( 7 ), and ( 8 ), folded and fit together , one inside of the other , to finish flat when being transported inside of the bag , thus giving shape to the bag , and convertible into a back rest when the bag is opened . sewn to the fabric ( 1 ) with two pieces of fabric ( 5 ) superimposed , there is a wooden structure ( 6 ), in a rectangular form , composed of two pieces of wood and two bars ( dowels ). the bars ( dowels ) are sewn on to the fabric ( 1 ), to give the bag shape , and , at the same time , to form the back of the backrest . the ends of the bars ( dowels ) are embedded in the other two pieces of wood . the strap ( 3 ) to carry the bag is attached to one of the pieces of wood of structure ( 6 ). attached , in an articulated manner , around the center of the structure ( 6 ), is another structure ( 7 ), composed of two pieces of wood and one bar ( dowel ), embedded in the opposite ends . the structure ( 7 ) serves to hold the structure ( 6 ) ( the back of the back rest to a third structure ( 8 ). the third structure ( 8 ), composed of two pieces of wood and one bar ( dowel . ), whose two ends are embedded within the two pieces of wood . three carved notches are seen on these ends of each of the pieces of wood , to hold the bar ( dowel ) of the structure ( 7 ). the two ends of the pieces of wood , opposite to where the bar ( dowel ) is embedded , have two wholes where the bar ( dowel ) of the structure ( 6 ) passes through to articulate this structure ( 8 ).
a bag may be converted into a back rest . the fabric is folded to form a bag , and there is a zipper on one side . three wooden structures are placed in the interior of the bag . these structures provide a back rest when the zipper is opened and the bag is unfolded .