Halfbacks with BCW or Bags Unlimited bags: what size? 0

[Deekworld]

Hi. This is my first post, and I apologize if this has been covered before. I searched, but I couldn’t find the info I was looking for, probably because it’s a weird question. 

I’m wanting to buy some Halfbacks from E. Gerber because they don’t have to be changed for many years. Also, with the volume discount, they are nearly the same price as coated boards. 

I’m planning to use them with less expensive PP/PE bags, but I don’t know what size matches up well with Halfbacks. I’m looking at the 750HB. Does anyone know if the BCW or BU silver age bags will hold the 750HB comfortably?

If not, would the 700HB fit them and still be sufficient to protect current and most comics from the last 30 years?

Thank you for any information you can provide.