You are looking for a medium black tub - which is not on the ground nor above head height. Nearby there may be canal boats moored as this is a popular walking spot, so please use extreme stealth. You'll need to be able to count carefully but in which direction you need to take - Betty's not telling
Please return the cache exactly as you found it. You will need to rehook and wedge it, then please check it's not visible from any angles. Don't forget to take a goodie. It can be for yourself, your kids or as trackables... Just remember that Betty will be 'Delighted' to know you found her, so let her know on FB if you can. https://www.facebook.com/BettysPack