I own many of these backpacks from DharmaObjects company in different styles.  Backpack is large and made of a burlap which has been color dyed and its also lined with cotton fabric made in Nepal and has wooden button toggles and a sinch of a rope cord.  Super big and nice for the price and so vibrant in color I LOVE these things as they are so kitchy/hippy.  Great for a gift which I also gave one of them for.  I am so happy I located them recently. Each design will be unique as fabric varies but its very colorful and nicely made.  Something you just cannot find at an ordinary department store as each is handmade.  I LOVE this item so it gets 10 stars ( 5 is the highest here but deserves 10 )  There are 2 adjustable straps and 3 exterior pockets.  Its adult size and unisex color/fabric.  Very Very COOL.
PS  I wouldnt suggest hauling super heavy items or prolonged water exposure if walking as its made of jute/burlap 100% natural.