We used 11 x 1.5L soft drink bottles. Each bottle weighed 1.5kg. We weighed each bottle and added and took water out until all the bottles weighed the same amount. Then we got two helpers to hold the bag and we put the bottles in. Another person timed it until the bag broke.
The Pam’s reusable bag won, it did not break. It lasted over 10 minutes. The green e-co bag was the second best bag. All the plastic bags were the worst for breaking. The plastic Pak n’ Save bag won out of just the plastic bags.