An exciting new product I recently picked up is the Marcum Roamer shuttle.
I always loved my little M1 and biggest and only complaint is that the flasher dial sat so low! The Roamer takes care of this and actually abandons the plastic shuttle system and incorporates everything into a convenient and smart hard/soft shell case.
It has transducer storage on the side as well as pockets for chargers and devices.
The Roamer is said to equip most other flasher models as well with similar width gimbal attachments as Marcum, such as Vexilar.
With my M1 equipped Roamer, I'm using a 10ah Marcum Brute lithium battery with Marcum USB port connections and a glow cup.