這句如何反譯成英文

膠袋尺寸如有不同, 請自行量度準確尺寸去修改。

如衹有一個膠袋大了或細了一點，就用單數(singular):
If the size of the plastic bag is different, please measure its exact size and make adjustment yourself.

如所指不同尺寸的膠袋多過一個，則要用眾數(plural):
If the sizes of the plastic bags are different, please measure their exact sizes and make adjustments yourself.

If each plastic bag have different size, please measure it by yourself in order to make corrections.

你想翻譯成口講會話形式定係包裝用嘅商業用語? 兩者好唔同, 唔好翻譯錯, 笑大人個口.

膠袋呎吋如有不同, 請自行量度準確尺寸去修改

The plastic bag foot 吋 like has the difference, please voluntarily measure the accurate size to revise