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Also, don’t forget that you can add a Mystery Sample Pack to your cart on ALL orders of $35+ as well.
From Birchbox:
This haircare trio is yours when you spend $35 or more on any full-size products in the Hair category, and use code HANZTRIO at checkout. Limit one per cart. Cannot be combined with other offers. Not valid on subscription orders. In order to return any item in your order, you must also return the sample trio.