Balenciaga Unisex Silver and Black Nylon BB Explorer Drawstring Backpack $399.00 Silver - $399.00 Quantity This product is currently sold out. Balenciaga Unisex Silver and Black Nylon BB Explorer Drawstring Backpack Condition: Brand new. 10/10. Retail $1,050 Includes: Dust bag, tags and care booklet. Details: Measures 16” width, 19.5” height, 1” depth.