YOU FILLED YOUR [Inventorium] WITH [Half-Price Sallamy] JUST TO KEEP ME OUT!?
I noticed a lot of people frequently ask about inventory, bags, and pet storage, so I'm making this quick reference guide. Link it to players who ask about it for your convenience. This guide is for maximum storage options, as some bags exist that are redundant or smaller and locks you out of larger bags. Listed in order on thread: Expandable bags, pets, and commodity bags.
Regarding all expandable bags: these bags can only be stored in the Main and Extra inventory tabs. I strongly recommend buying an Extra Inventory Key from Shyla for 100,000G, and moving all your bags in to it. Even when your extra tab expires, you can still access your bags by right clicking and pressing Open on them, so it saves a lot of space without continued use of gold.
Item Bag (150)
All characters start with this in MabiPro
Note: Items in this bag can be priced with a Merchant License to sell in personal shops.
Item Bag (6x8)
Buy it from General Stores for 79800G
Note: Easiest accessible secondary bag, all your characters should have one.
Item Bag (8x10)
Buy it from General Stores for 100,800G and then use Shyla's 30 Day Expiration Extension Keys to use
Note: When it expires, just buy and use another key to renew it. Items held in this bag are hostage until then. It's pretty cheap all things considered, but it's also annoying so I only recommend it for your primary characters.
Side Bag (42)
Bee Side Bag can be obtained by exchanging
40 Royal Drops to Melia in Blago Prairie
Heart Side Bag was obtainable during an event. They may or may not return someday
Sword Side Bag was obtainable during an event. They may or may not return someday
Note: You can only have one side bag. If you're looking to get one, Bee Side Bag is your only option currently. They're both 42 spaces, but shaped differently.
Small Trinket Box
Buy it from Madoc in Port Cobh for 50 Florins
Note: As described, its 9 spaces for 1x1 items only. Great for accessories, slates, consumables, or premium items. Expanding 4 inventory spaces to 9 isn't the best value though, so don't prioritize this over other more important early game Florin shop options.
Alchemy Crystal Bag
Buy it from Eabha in Taillteann for 24,000G
Note: Unlike every other bag on this list, you can own multiple Alchemy Crystal Bags. They only hold alchemy crystals though, so non-alchemists only need one. Alchemy users may find themselves owning several.
Score Scroll Bag
Buy it from Briana in Tara Castle for 77,000G
Note: Although you can only put score scrolls in them, all overflow inventory that are not score scrolls automatically goes in to this bag. You can almost treat it like a temporary inventory that doesn't pressure you with a drop timer.
Kiosk
Buy it from General Stores for 50,000G
Note: These can only be operated in Main inventory and not Extra inventory. You can only open and access them when setting them up in town. It is very restrictive, but for merchandising purposes they're pretty nifty. You can also treat it as a cold storage option, but I think banks are better for that since they're more accessible.