Thermo Scientific™ Nalgene™ LDPE Safety Bottle Carriers. Safely and easily hold 2.5L and 4L chemical bottles, with or without finger loops, using these LDPE safety bottle carriers. Pricing and Availability. Thermo Scientific™ Nalgene™ 500mL LLDPE Safety Bottle Carrier. Secure bottles and reduce chance of bumping, cracking or chipping