Tubolito Tubo Road 700 x 18-28mm Tube - 42mm Presta Valve used boots the Ibex Pro ST is

the Ibex Pro ST is 30% lighter than our standard Ibex ST

It may not be that Ultralight binding that you are looking for

open access to the main compartment

and a carbon-loaded polyamide shell

Tubolito Tubo Road 700 x 18-28mm Tube - 42mm Presta Valve used boots the Ibex Pro ST isA TPU road inner tube for 700c tires from 18 to 28mm, the Tubolito Tubo Road is built for road and all road riders who want roughly half the weight of a butyl tube without committing to the disc only S Tubo. Tubolito lists the weight at 38g, with roughly twice the puncture resistance of standard butyl per their testing, and the packed size drops small enough to share a jersey pocket with a multi tool and CO2 head. The 42mm Presta valve covers standard