Sturdy aluminum helmet box for reliable daily use Material and durability Constructed from 1.5 mm thick aluminum alloy for strong, durable performance Provides compressive and loadbearing strength, wear resistance, and drop resistance Built to withstand regular riding conditions and longterm use Flexible storage capacity 28L: fits 1 half helmet 36L: fits 1 small full helmet 45L: fits 1 full helmet plus poncho 55L: fits 1 full helmet plus 10 bottles of water 65L: fits 1 full helmet plus 10 bottles of water 80L: fits 2 full helmets plus 10 bottles of water 100L: fits 2 small full helmets plus 2 half helmets Double lock antitheft box features a onebutton quick lock for secure closure Provides simple, reliable protection for stored items Dustproof and moistureproof design Corner and edge design with leather lining Moistureproof construction guards contents from wind and rain Use scenarios Daily commuting Choose a capacity of 36L or 45L to store a helmet and essentials such as a poncho Quicklock feature adds peace of mind for onthego locking Weekend ride or gym run 65L or 80L capacity accommodates two helmets plus water or other small items Secure, weatherresistant storage keeps gear dry and protected between rides Longer trips or touring 100L capacity allows packing two small full helmets plus two half helmets, with extra space for accessories Robust aluminum body supports frequent loading and unloading while protecting contents Notes All specifications refer to the stated capacities and compatible helmet configurations No additional items or alterations beyond the stated features are assumed or added This description preserves the original product's specifications and functions while presenting a clear, practical overview for informed .