Wondrous Item, rare
This magical bag, containing an Anemoi, is used by sailors to travel quickly across the sea. It can be partially opened to produce any amount of wind from 1-48 knots (1.2 - 55 mph). It can only be open for (55 - the number of knots being used) minutes before having to be closed (taking an amount of minutes to recharge equal to 55-the amount of minutes remaining in the bag). If it is used to move above 48 knots or past its time limit [CLASSIFIED]. Someone within the direct path of the wind must make a DC 15 Dexterity saving throw or be thrown back 35ft and fall prone.