I am planning to make a new japa bag, so I am using this opportunity to check for anything I am not aware of.
Of course, I could find plenty of pictures and information on the web. But all the pictures of japa bags that I have found, and all that I have seen on devotees have the common characteristic of being open at the top, so that if one wishes to carry the bag on one's hand, one has to wrap the strap around the wrist. I had a japa bag like that, but found it tedious as it kept loosening and slipping off, so I sewed my bags together at the top, so they can be carried on the wrist comfortably.
I have never seen any such bag anywhere else, though.
Are there any rules for making japa bags?
Is there any significance why it is (supposed to be) open at the top?
Is there anything I should specifically take into consideration when making a japa bag?
(I gathered that a japa bag should ideally be made of natural materials, preferrably cotton, and only from new materials.)
Interesting that all sannyasis and brahmacaris of the Gaudiya Math (in the days of BSST) had plain white bead bags. Cotton is good, I prefer silk, it gives me 1/50s second advantage for each mantra;-)
One devotee mentioned to me that acc to B.G. Narasingha M. the white color of beadbags symbolized the connection of GM (which adopted saffron for renunciates) with white-clothed followers of Mahaprabhu beginning with Gosvamis.
I have heard that natural silk shouldn't be used in devotional service, because in the traditional production of silk, the larva inside the cocoon is killed.