Unless you MacGyver up a big knot, which will help with the usefulness but, lets be real, look totally ridiculous
By searching the internet I found the Tough Traveler Dog Carrier, the perfect solution
Two different sizes are available small will hold three leaders, and large can be used to store six leaders and the leaders are stored on the hard plastic insert which has been designed with slots to hold Hybrid Lead Clips, Heli-Safe Stems, or swivels (depending on what you have attached to the end of the leader), securely in place when not in use, with the rest of the leader wound around the Leader Safe in the corresponding channel
Praktisches, abnehmbares Sitzpolster aus G-1000 HeavyDuty Eco-Gewebe
They added a single wire keeper and stiff weedguard at the perfect angle to come through cover effortlessly but collapse on the bite