Portability is sometimes an issue associated with chains and locks, which is why so many riders don't bother taking one with them when they're out and about.
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However, Milenco's compact Chain bag is secured to your tail-end with accompanying bungee cords and enables you to stash your chain when riding. 
 
Suitable for all Milenco Coleraine and Dundrod chains and lock. NOT SUITABLE FOR SNAEFELL CHAINS
 
Then it's easily accessible when parking up and locking down !