I gonna use my main character (a knight from a Open-PvP server) build as an example here on what you will need to always pay attention to carry and also to show how I do that on practice. Pay attention that you do not to follow exactly what I did here, but I hope that it will give to who is reading some idea on how can we achieve a good organization of containers.
Well, I myself like to use the Brocade Bag as my "main container", more because I appreciate seeing all of the 8 types of containers that I classified as important in a tight and simplified space, not to mention that it is the most beautiful bag in the game in my opinion :P It will also guarantee that any item that I "dress/undress" will be put on the very first container showed (I will explain soon more details about that), but let's move on! Starting at the upper line of the opened bag above, looking from the left to right, we have:
IMPORTANT NOTE: It is not a problem to me at my current level and main vocation on Tibia, but you may want to change the bag mentioned here to a backpack in case of being a really high level char due to the imbuement slot usable on backpacks! Bags do not have these slots! (At least until the date of the edition made on this post: 03/07/2019).
Zaoan Chess Box: Here I keep almost every equip that I dress/undress frequently (hunting/PvP gear, gear with imbuement or even a "speed set" to walk faster around). It is my first container for everything basically. For example: if I buy something, things will be inserted automatically here if there is room inside the box, and then I will sort out what is bought and distribute it to the adequate place. The Zaoan Chess Box is kind of heavy but it has a massive space for items, thus it serves magnificent as a backpack. Another cool alternative for you to put here later on is to get one of the new Blossom Bag. You can use whatever container you want, but I like to leave one with such characteristics permanently right here to prevent any problem of items "popping" on others containers.
Parcel: Needless to explain, having a parcel with a label already signed with your name is recommended. You will never now when you will need to send something to the safety storage of your depot! I would recommend to keep one always at hand and on your sight.
Camouflage Bag: Just a nice looking bag where I store my food. Mostly I just keep it closed, since I have a hotkey/action button configured with a food that I frequently eat. You can fill it up with some sort of food that you like to consume
Birthday Backpack: My keys and items required to access certain places or teleporters (i.e.: mushrooms needed to leave Draconia) stay here! I like to keep a special place just for that because I like to own organized containers with set of keys along with scrolls/labels explaining each key function.
Jewelled Backpack: My loot recipient! Here I put every backpack configured to receive loot/gold while hunting.
Anniversary Backpack: I insert here any quest item related to missions that I am currently doing on Tibia.
Crown Backpack: All of my gear related to exploration and such (pick, rope, shovel, et cetera...) goes here. I also add here my Obsidian Knife and Blessed Stake. Important: If you are a Free Account, make sure to carry around stamped parcels with you. It will help you on places where levitate is necessary (i.e.: If you want to leave Hellgate without going to Draconia)
Santa Backpack: Used to store my potions and runes, along with special Jean Pierre's foods or boost potions (i.e.: Berserk Potion). I also insert here hunting supplies as backpacks of rings and amulets (on the Zaoan Chess Box I keep permanent items just like the butterfly ring or platinum amulet, which are non consumable items that will be used in case of a combat/need to stop hunting). Although I am a Knight, I would recommend to leave here containers of ammunition and attack runes as well.