TRANSPORTING A CHAIN ON A BIKE CAN BE AWKWARD SO ABUS CREATED 2 DIFFERENT HIGHLY DURABLE FRAME BAGS SUITABLE FOR ALL OF THEIR CHAIN LOCKS. FIXING IS VIA STRONG VELCRO STRAPS. PLEASE NOTE THAT THE ABUS CITY CHAIN X-PLUS 1060 WILL ONLY FIT IN THE LARGER ST250 BAG.