Here’s a nice gift for travelers to kick off 2015: Alaska Airlines is waiving its $25 first-bag fee – for the month of January.

To take advantage of the offer, passengers must be a member of Alaska Airlines’ Mileage Plan, but anyone not yet a member can easily sign up for free online or at the airport before they check their bags.

There are some rules and conditions accompanying this offer:

The promotion is good on flights between 12:01 a.m. Jan. 1 through 11:59 p.m. Jan. 31, 2015 and will apply to Mileage Plan members and their companions if they are traveling on the same reservation.

Also, all flight miles must be credited to Alaska’s Mileage Plan to qualify.

For those who haven’t checked bags on Alaska Airlines before (or in a while), there’s another checked-baggage benefit to keep in mind: the carrier’s baggage service guarantee promises that if a checked bag doesn’t reach baggage claim within 20 minutes of the plane’s arrival at the gate, the passenger is entitled to a $25 discount for use on a future Alaska Airlines flight or 2,500 Alaska Airlines Mileage Plan miles.

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