Petzl Ultralegere Pulley P00A nofurther10 then the Mantis fits the

then the Mantis fits the bill perfectly

It also looks lovely too

Designed to fit most lockable luggage zips

Sheaves mounted on self-lubricating bushings for good efficiency

Petzl Ultralegere Pulley P00A nofurther10 then the Mantis fits theULTRALEGERE PULLEY FOR OCCASIONAL USE The ULTRALEGERE is a simple nylon sheave that can be installed on a carabiner. Size and weight reduced to an absolute minimum to make the lightest pulley available For use with a symmetrically shaped carabiner with rope no thicker than 13 mm in diameter Specifications Weight : 10 g Min. rope diameter : 7 mm Max. rope diameter : 13 mm Working load : 1 kN Material(s) : nylon Reference : P00A Made in : FR Guarantee :