"Birzman’s tough 41g Uncage has an unfussy yet attractive design that’s formed from a high-polymer material.
Generous bolt slots ensure easy fitting, and the cage has great rigidity while also boasting enough flex to shrug off daily riding abuse.
Chamfered, angled edges guide all bottles in smoothly, with a solid click signalling complete engagement and two internal ridges keeping a reassuringly firm hold.
A supplied Velcro strap can be used to attach a spare tube and levers to a slot beneath the cage, too." - Bike Radar