Update: I was unfortunately not aware of Shamus Young's severe criticism of Fallout 3 available here to link in the original piece and I regret that. It dovetails rather nicely with what I've written and it's much better executed than my piece. I strongly recommend anyone...
Drop it from the very top of the bag so that it falls all the way to the bottom and breaks, or stack a bunch of heavy groceries on top.
At the end of each round, when the bag is being moved, you need to balance your handset for a few seconds to prevent a last-minute crush.
Watch out for telltale facial cues from the items. Crisps, and other vulnerable produce, will quake with fear when something too heavy hangs over them.
A countdown clock will appear on products that are about to be crushed, giving you a few precious seconds to make some hasty adjustments.
Each level has Trophies available for special combos, like stacking juice and fruit together to create a ‘healthy breakfast’.