the-witcher-3
I'm still in the first tutorial area, White Orchard, but I already ran into the weight limit of my inventory several times. From what I read, I should be able to increase the inventory limit by buying some saddlebags.
Are there any saddlebags available in White Orchard, or where is the first opportunity to get them?
I found a recipe for Petri's Philtre on the first floor (up the ladder), at Drahim Castle, in Velen.
From the pictured Quick Travel point, walk towards the left of the castle. You will see a doorway that can be broken with Aard or sword. Walk through the doorway, and climb up the ladder found within. The formula is in a lootable box near the next ladder up.
This is likely one of many locations to find this formula, and it's possible that it was a randomly generated loot item.
To get vitriol you must obtain the recipe from the a druid located in Skellige Isles near Gedyneith fast travel post; it should be somewhere on the right. There should be a alchemy logo near it, if not travel down the hill while going left.
Moreover, to be able to trade with this druid you would have to complete his quest. I believe you have to be around level 21. This quest is combined of 3 parts, again, very long but that's what you get with RPGs. Once the quest is completed you would be able to trade with him, and get the recipe.
(Sourced from http://www.gamefaqs.com/boards/702760-the-witcher-3-wild-hunt/71858977)
You're welcome!
Best Answer
See below the other answers where you can buy one in White Orchard. For other options to get saddlebags:
According to the Prima guide you can win them in horse races.
In addition to saving the Northern Realms from the threat of the Wild Hunt, there are additional activities you can try; and two of these pastimes are fistfighting and horse racing. The former allows you to hone your unarmed fighting skills, and should be undertaken after reading up on the Training section dedicated to this activity. The latter enables you to equip Roach with additional saddlebags, saddles, and blinkers that help you store more equipment, increase your horse’s Stamina, and reduce Roach’s panic level. All are well worth attempting; the horse races as soon as possible.
The location of the races:
Gamezone says you can craft them:
This is from Eurogamer
Once you reach the bustling village of Midcopse, take some time to explore. The armourer has an interesting selection of goods, including two cryptic maps, a range of master and common crafting components, some diagrams, magic items and some pretty decent armour. The nearby merchant, meanwhile, can offer up new Gwent Cards, Horse Blinders to reduce your steed's Fear level, a Saddlebag to increase your maximum inventory weight, plus other treats.
Witcher wiki has a Saddlebag section that is a bit sparse as yet as the game only came out today. It will be updated to show all locations. You can view it here