Be nice if you could name spellbooks and bags, but sadly you can't. I don't think there is a limit to the number of spells in a book - if there is, it must be pretty high. You can also carry multiple spellbooks, and they will all be soulbound, and you have access to all the spells. That means you can have separate books for types of spell, or if you are planning on selling spellbooks. It also means that if you are using a scribe you don't totally trust, you can just give them the scroll plus a new 1g spellbook - limits your losses if they scam you.