Ziplocks caused my grapes to rot while Organza bags did not and kept the fruit perfect. No apparent difference between the 2 for apples although the Organza bags were easier to install, allowed to tie string to branch to reduce windfall losses and looked way better than a tree covered in plastic bags. Hopefully I will have pears and plums to experiment on next year but so far in my zone 4 but hot humid summer climate the Organza bags are winning. See my post under apples as well as at the end for grapes for photos: My Backyard planting experience (Part 2) - Zone 4a/b Quebec, Canada - #3 by hungryfrozencanuck4b