I thought I'd give the Jug-It™ jug another chance and FAILed. Milk spilt enough to need 5 pieces of kitchen towel to mop up.
An empty, open Jug-It™ jug has its CofG W-A-Y outside its base and WILL topple, predictably making more mess.
I thentried to post on Sainsbury's forum, which has a couple of pages about Jug-It™ jugs and bags but got redirected to their FaceBook page. I made my feelings known there but resent having to use Facebook for this.