Bag of ceaseless winds

This bag is made of fine white silk, adorned in silver and 1 medium moonstone. It is 1/3 feet wide and 1 foot long.

You can use an action to speak one of three command words and open the sack, whereupon the sack will produce fresh air for a certain duration. 

• "Breeze" will produce fresh air for 1d10 minutes
• "Gust will produce fresh air for 1d4 hours, and will produce a minor wind.
• "Gale" will cause the bag to blow a strong wind current in a 20-foot long and 10-foot wide cone. Any creatures must make a DC 15 strength save. On a failure, the creature is knocked back up to 20 feet and is knocked prone. On a success, the creature is only pushed back 5 feet and isn't knocked prone. You can also use this on an object that weighs 25 pounds or less. If it weighs 25-11 pounds, it is knocked back 10 feet. If it is 10-6 pounds, it is knocked back 20 feet. If it weighs 5 pounds or less, it is knocked back 40 feet.