Grocery bag handle. Makes it easier to carry multiple grocery bags. Organic form handle makes it easier on the fingers.
Print any layer height but with 100% infill for maximum strength.
ABS has a tensile strength of 5366 PSI ...
Cross section area of each hook is 0.16 in^2 ...
Thus maximum force on each hook is 858 pounds.
Keep in mind that the calculation is for a solid ABS plastic bar. The hooks are also weaker than the extensions holding them. It should be strong enough for any use though.
EDIT: Tested up to 76 pounds per hook, so far (that's 9 gallons of milk)
EDIT: Tested using 250 pounds per hook (rope tied to step, holding my body weight)