Reduces breakage and spillage when transporting glass and plastic bottles. Two foam inserts with six holes (consisting of removable circular sleeves) keep bottles separated. Remove concentric foam sleeves to accommodate up to six bottles with 2-3/8-in. (60-mm), 3-1/2-in. (89-mm) and 4-1/4-in. (108-mm) diameters. Accommodates Nalgene™ 250 and 1000mL round bottles, disposable filter units, and reusable filter holders, 100, 500 and 1000mL glass media bottles. Sturdy enough to hold six full 1000mL glass media bottles. Carrier will not crack or shatter.