Super heavy duty Lewis bags are the classic option for crushing ice. Put ice in bag, holding it at the opening end, take a heavy ice crushing object and bash the bag until you get crushed ice at your favourite consistency. These Lewis bags are custom made for us and we have the ties tied so that you can just flip them over the top, no need to ever undo the knot. Once you're done, flip the tie back over, scoop out your ice and enjoy a yummy cocktail! Works as great stress-relief too!