Fruit pastilles & Polos could easily slip through the holes, you need to compensate for your potential loss, if you want 3 packets of Polos try putting 6 in your trolley, then if you have to suddenly brake near the the cornflakes, you might only lose a couple of packets, not the lot.
There should be warning lables on small items or a special area in the trolley for them, there must be millions of packets of Halls cough sweets on supermarket floors nationwide.
Love ProfB xxx