comments:
Winter_drivE1 posted on r/workout5w
It's this one https://www.walmart.com/ip/Contigo-Shake-Go-Fit-28-oz-Black-and-Clear-Shaker-Bottle-with-Flip-Top-and-Wide-Mouth-Lid/40141841 And I always make sure to at least rinse mine after using it. If I can't use soap I at least rinse it out with water so there isn't residue in it