Material strength experiment done and repeated

I conducted the experiment recording 3 sets of results during the long weekend.
Aim: To find how much weight each material and shape will hold.
Hypothesis: As the weight increases, the square paper will take the longest to break.
Equipment:
Ktichen scale
100g weight
200g weight
500g weight
1kg weight
Materials:
2 Plastic bags
Roll of aluminium foil
Roll of cling wrap
Paper
Method:
1) Cut the plastic bag, cling wrap, aluminium foil and paper into three shapes each; square, rectangle and circle.
2) Weighed the plastic bag where the weights would be put on.
3) Held up the plastic bag with each material of each shape for 10 seconds.
4) If it didn't break, then repeated step 3 with 100g weight and if broken, then recorded down the weight it can hold and the weight at which it broke.
5) Repeated steps 3-4 with 200g, 300g (100g+200g), 500g, 600g(100g+500g), 700g(500g+200g), 800g(500g+300g), 1kg, 1.1kg(1kg+100g), 1.2kg(1kg+200g), 1.3kg(1kg+300g), 1.5kg(1kg+500g), 1.6kg(1kg+500h+100g), 1.7(1kg+500g+200g)kg and 1.8kg(1kg+500g+200g+100g) weights.
6) Repeated steps 3 to 5 with all the different materials and their shapes.