MOBOT Official - Big Bertha 40 oz - Special Ops - Foam Roller Water Bottle FDA-approved recycled STAINLESS STEEL 18/8, wide mouth Athlete-grade, Non-toxic EVA foam, tested to 350 pounds BPA-free, silent sip and removable straw, easy carry loop for bag attachment Hydration and massage in one portable, eco-friendly package Air travel and Athlete Approved.