Caster Holster is fairly simple to arrange. As a Fresh, you will need at least the following listed. The remaining capacity, you can fill it with more Resistance Reraiser and Resistance Ether Kit. 

You don't have much space as a Caster due to Lost Font of Magic being very MP reliant. (Unless BLM)

Only bring Cure IV if you are assigned to Cure IV!

Note: Cure IV's additional effect of Bravery on Party does not work if you are not on Pure Essence of the Elder.

Pre-Entry holster allows you to free up capacity for fights from Boss #3 and beyond. 

Tip: Save this as a Preset in one of your Save Slots to easily reload up after every run

You will need at least 2 Sets of Cure IV (one pre-loaded) to last till Boss #4.

If you have space, Bring more Resistance Ether Kit.

Note: 

• Pure Essence and Reraisers are used at the very start of the cache. 

• Reason: We need to maximize every capacity we can up to Boss 4. Since by this point, you should be familiar with Trash #1 fight and mechanic, we expect little mishap to progress. 

Lost Flare Star should be pre-loaded at the cache. There is no charges and thus would not run out. 

Note: 

• Pure Essence and Reraisers are used at the very start of the cache. 

• Reason: We need to maximize every capacity we can up to Boss 4. Since by this point, you should be familiar with Trash #1 fight and mechanic, we expect little mishap to progress.