My first problem is storage/size. I not only have credit, debit and store cards, but 'loyalty' cards (a slight misnomer, as I have one for most stores) and membership cards etc. There are never enough slots in my purse and I find it gets very bent out of shape. (This is without all the receipts.)
Also, how do you cope with the conumdrum of opening the card section of a purse to get out - for example- your Boots advantage card, then going to the note slot to extract a fiver, then opening the coin department to out away the change, all the while trying to replace the Boots card without dropping anything and while simultaneously pushing a pushchair while an impatient queue looks on.
I am very clumsy with this.