Enlarge the rims on the bottom and top of tin cans while increasing the hollow area under the can to disguise the reduced capacity
Change the way biscuits are arranged inside plastic packaging to reduce the number of biscuits that can fit into the new configuration
Reduce the number of sheets on a toilet roll, or roll of paper hand towels
Change the weight of a product only marginally so the packaging can remain the same
Change the shape of a bottle so that it appears to be larger than other products with the same volume
Keep the height of a bottle, or can, the same but reduce its diameter marginally
Make the opening on a tube of toothpaste larger so that consumers unintentionally use more toothpaste