The titanium version is distinctively different in size, bumper design (none), pack pocket friendliness, and versatility with stoves. GeoPress Ti is slightly smaller in both diameter and height making it easier to handle and optimally sized for any backpack pocket. It's also bumper-free which makes it incredibly easy to slide into pockets with ease. The Outer Ti Cup features large folding handles sized for optimal functionality for boiling water and cooking at camp alongside hot coals or on most pocket stoves. GeoPress Ti is undoubtably Grayl's most engineered bottle to date. Both models offer the highest level of protection from waterborne pathogens (99.99% of virus, 99.9999% of bacteria, and 99.9% of protozoan cysts, including Rotavirus, Hepatitis A, Norovirus, Giardiasis, Cryptosporidium, E. Coli, Cholera, Salmonella, Dysentery). They also filter many heavy metals, chemicals, and microplastics.