This here Fish Bag is 17" x 6.75" and comes with a fruity little rubber zipper pull, D-ring and buckle matched to the adjustable 1.5" wide cotton strap, and can be adjusted to be between ~36" - 80" long (91cm x 203cm) (including the length of the bag) with the included strap-extender. He can be worn as a crossbody or a (large) fanny pack. 

The interior is lined with a durable cotton'. The large main pocket extends the entire length of the fish and is big enough for a standard sized water bottle, Nintendo Switch, or small journal. A smaller interior pocket is great for your wallet, phone, or your pencils and pens.