I have a theory about handbags. Women start out with small handbags which, when they are young and haven't accumulated much, are sufficient for their needs. As women age they accumulate more stuff and, every time they buy a new handbag, they purchase one which is slightly larger than the last. Consequently there is never any need to sort out the handbag as its contents can just be tipped into the new, larger one, with room to spare. Eventually the accumulated handbag contents of a lifetime become so great that elderly women require a wheeled shopping trolley to house them. The wheeled shopping trolley is actually the ultimate handbag.
I have produced a handy picture to demonstrate my theory.
If you click on the picture, you can see it in its proper size.