Hi,
I have added to the post on 'How much does my bag weigh' for weights of medium and large black nappa quilted, Oxblood (as this comes in large for Oak and Oxblood but no external rear zip) and Blue camouflage.
Re the crease, I looked at images of the bag being carried over the shoulder, and none of the ones on the Mulberry website show the bag clearly being held in this way; either you cant see or the model has her hand over the flap. There is a photo of Cara at a music festival holding the bag over her shoulder and the flaps are up, looking as if they have been 'styles' that way possibly to avoid the fact that they are creasing up.
I think this is a design fault (on Cara's part - as if!!) - Cara is 'grungey' and therefore maybe the bag is meant to be all out of shape - the photos of her with the bag show it with flaps pushed up, and out of shape like a child's lunchbox, which IMHO isn't at all right for the leathers they have used for the bag itself.
Good luck today at the shop.
My heart was set on a large black quilted but I really LOVED the blue camouflage one, except the zip made it look like an old lady's shopping trolley (I thought it just needed the wheels and long handle to complete the look) and it weighed a ton. Also I have concerns that the black nappa may crease horizontally in time which I dont think would be right for this bag.
If you look on Samorga, while there isn't a specific CARA liner if you type in the dimensions there is already a generic liner on there which will fit, although it may not be tall enough.