Max I have used X PAC vx21 material from Point North, www.profabrics.co.uk
. Not cheap at £10.50 a half metre. My bag doesn't look so neat inside and I am lucky my wife makes and sells custom soft toys. So we have some good sewing machines. Although I'm attempting to make a front harness bag and the Bernina's stopped working. Give it a go, as a plumber never thought I would be using a sewing machine but I find it quite therapeutic.