This product is 'pre-production' meaning that it is currently 3d printed and carefully finished by hand making it entirely unique.Aero design tailored to be fully integrated around the frame geometry and to fit neatly behind the Elite Crono Aero bottle. Noticeably better bike handling/weight distribution storing bike tools low down by the BB compared to higher up hanging off the saddle. Matt black paint finish Lid stays securely closed with strong magnets. Internal foam base pad reduces rattling. Weight approx. 195g (Giant Trinity size M) Internal storage for spare innertube, mini pump (max internal pump length 150mm x 20mm diameter), co2 cartridges & repair tool etc. Internal storage volume approx. 862ml (Giant Trinity size M) Fixes to bike frame securely using existing standard bottle cage fixings. Planned to be wind tunnel tested for aerodynamics very soon (keep an eye out for the full blog coming soon). Should you have any queries or questions please do not hesitate to contact us and we will be only too help.