Myself and Steve tackled the challenge of making solid models of the bag to try and clarify the design features but then also to figure out the sizes we though it needed to have. So, initially we made the model below to show the sizing.
While we made the model we realised that it was much thicker than we thought it needed to be so we thinned it by 30mm to a size which we then thought was better. We then proceeded to make a smaller model which served the purpose of bringing it around to show the concept of the idea, this was a smaller scale model of the first model we made.
Tom's Blog 