yes Helen I agree with you about mixing items in your cases as we go with our 2 boys I always always make sure in each case there is suncream, flipflops ,swimwear and various going out gear for each of us I have always done it this way, someone took my case at the airport by mistake about 20 years ago when I was very young and slim

got it back before we left but turned out it was a very old man I think the shock would have killed him if he had got to his
hotel and opened the case to find my skimpy bikinis and undies

so be warned remember to mix your cases