From next year customers will have the option to purchase reusable bags, and a non-plastic boot liner alternative will be introduced in coming months, Cowie said.
Mitre 10 posted 38 per cent gain in full-year profit last month.
Profit was $4.4 million in the 12 months ended June 30 from $3.2m a year earlier, and revenue from the sale of goods rose to $818m from $767m.
The cooperative, whose shares are held by its store-owning members, supplies goods and services to 81 outlets.
Mitre 10 joins New World and Countdown in its bid to ditch the use of single-use plastic bags by the end of 2018.