Convenience Store readers have responded to Lesley and Bill Brown's call for suggestions of the most annoying packaging (The Browns battle the bugs, C-Store, January 9, 2009).

Several retailers contacted C-Store to tell us that Heinz tinned products cannot be stacked. "They don't have a lip on the top, so they rest on the ring pull," said Paul Mather of Sherston Village Stores in Wiltshire. "Trying to stack them is like playing Ker-plunk."

"They don't fit together and that makes them very untidy on the shelf," added Bennie Krige of Ewyas Harold Village Store in Herefordshire.

A Heinz spokesperson said its cans were designed for minimal environmental impact, with an underside which allowed a can opener to be used. The cans were not intended for stacking, Heinz said, and suggested placing a whole tray on the shelf.

Other items under fire were Silver Spoon sugar 1kg bags because "they often leak" and Soft Mint and Fruit Gum rolls which lose outer wrappers.

What packaging gremlins get your goat? Leave your comments here.