How strict is Spirit Airlines about the free personal item measurements?

Is it okay if my personal item is 18x15x7 but the personal bag item measurements for Spirit Airlines is 18×14×8? Will they charge me extra?

It's hard to predict exactly how strict they will be because it really depends on who is working and how much hassle they want to create. My sister has twice been charged for her personal item because it was slightly over the allowed dimensions, and even though it easily fit under the seat in front of her. I've never taken my chances and always make sure that my bag is small enough.

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