This post was published 9 months 11 days ago which may make it out of date. This does not mean the information is wrong, or useless - it is a warning just in case!This is a repost of the information found in the Item Overload! Bank Alts, original and best? post. I am reposting it because it is important information that needs to be highlighted on it’s own.
The following assumes, that all bank bags purchased, and all bags are of the same type – as well as the following prices.
Netherweave Bags = 10g
Frostweave Bags = 80g
Glacial Bags = 650g
Crafting Bags = 100g
| Bags | Slots | Cost | CpS |
| Netherweave | 220 | 135g | 0.7670 |
| Frostweave | 264 | 905g | 4.1136 |
| Glacial | 286 | 7175g | 29.6488 |
| Crafting | 396 | 1125g | 3.1960 |
As you can see, even with 32 slot crafting bags, Netherweave Bags are cheaper per slot gained. This means that if you have the character spaces and don’t mind the extra work then you are always better off making a new bank alt rather than buying bags bigger than Netherweave for your existing bankers.
Remarkably this is true even if you can get 32 slot crafting bags for 25g each! They would have to be 22g or less to be more worthwhile. The only crafting bags seen under 22g each commonly are Inscription Bags. Just remember, if you can get the crafting bags for under 22g each then they are definitely worth using instead of neatherweave.
Obviously mains are slightly different, and people are willing to prepared to pay higher CpS for the convenience of additional inventory on their most played character. This information is primarily for the storage of items that would normally be sent to bankers.

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Note that if Netherweave Bag price goes over 16g 32s (not an uncommon sight on some servers), it becomes more profitable to make a personal banking guild, since the first guild bank tab has a CpS of 1.02g.
Ephemeron´s last blog ..Universal Balance
A very good point! This will definitely be mentioned in the guild bank part of this series.