I design this little carrier "box" for me to carry 6 BA61 Sennheiser batteries plus 2 BA62 and 6 Wisycom batteries for the wireless packs of Sennheiser and Wisycom. The fit nicely and has a handle so you can hang it or grab it all together. You could remix it and add as much batteries as you need. Printed in TPU with 15 % infill