What is your shipping error rate?

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I am manually fulfilling all my orders and I know I'm going to make SOME errors, but I obviously want to minimize them.  We have about 50 SKUs and about 50 shipments a day with a 1% error rate.


Just curious if that is abnormally high or what?  Trying to understand what are the errors and how to minimize them, but would like to know where we stand in terms of average mistakes.