Go Series Replacement Membrane Microfilter RBACK-080-PSAR and our 4 Degree™ elite

and our 4 Degree™ elite fit system for a peak-performance fit

New Coreprotect water resistance feature for dependable use in tough conditions

Label it with any non-toxic dry erase/chalk marker

Insulated Flex Straw Cap is leakproof when closed

100% Merino wool fabric made with an interlock knit for enhanced comfort

Go Series Replacement Membrane Microfilter RBACK-080-PSAR and our 4 Degree™ elite__________________ Features Compatible with Go series water bottles purchased 2023 or later. Not compatible with earlier models that feature the flip up mouthpiece and carabiner attachment. Protects against bacteria (including E. coli, Salmonella), parasites (including Giardia and Cryptosporidium), microplastics, chlorine, organic chemical matter, silt, sand, and cloudiness; improves taste Long lasting membrane microfilter lasts up to 1,000 gallons