I use it very often myself. I store dyes I use often for glams, gear that I want to put in my glamour dresser next time I visit my squadron (if you put it in the saddlebag, it will prevent you from accidentally donating it to your GC if you're spamming turn-ins), unfinished relics/relic materials, random deep dungeon/exploratory zone odds and ends...


Basically anything that I don't wanna lose in my retainer's voidgate of an inventory, that I might need when I am not near a bell or for temporary storage of certain items.


The game is somewhat blind to the saddlebag, so you can also use it to carry 3 treasure maps on you at the same time (one deciphered, one in your inventory, one in the saddlebag)


My FC buddy has his about to burst from relics that he manually glams onto his weapons. Most people I know typically store dyes and their personal assortment of random bits and bobs.


For those who use it often, you can set a keybind to open it from the Keybinds menu, along with many other useful things. I think it's comfortable!