My alt didn't have much for bags. He was power leveled as a RAF alt and didn't need the space. I picked up that mats for 2 16 slot bags and 2 32 slot inscription bags and had my other characters make them for me.
The more I got into glyphs, the biger the demand on my bag space became. I later replaced those 16 slots for 2 more inscription bags. Then my bank bags were next. Today I have 4 inscription bags on my scribe and 5 inscription bags in my bank. I have those 2 empty 16 slot bags (and 2 other smaller bags) handy for when I make large herb purchases or do mass milling.
My stock grew much faster then I thought it would. At first all of my inventory was kept on the ah. So I only needed space to run from the mailbox to the AH. Now I keep a stock of glyphs above whats on the AH and I am listing so many different ones that I cannot fit them all in my 4 inscription bags.
When I am stocked up the glyphs take up atleast 6 inscription bags.