On one of my systems I use the ProfitUI bags, which don't have any titles or deadspace and are smaller than default. You can extract the eq2ui_inventory_bag.xml file from the ProfitUI download.
Another option would be an even smaller bag based off of the ProfitUI:
Link
Here's another option:
Link
This one gets rid of the frame as well, I believe:
Link (probably most like what you are looking for - please correct me if I'm mistaken)
There are several of these type of mods available. Most may show a screenshot with the title/frame/background but usually these can be removed via the window options. You may need to download a few and see what works best for you.
Again, these are assuming that by 3/4 you are referring to 75% icon size and not column/row layout.
I'll also take a look at my personal custom bags to see if the title can be removed but I can't remember whether or not it's something that I included in the mod. However, the frame will always be visible as I've never cared too much for frameless bags, personal opinion of course.