How can I increase my carrying capacity?
As you noted, you can buy a backpack to add 10 storage to your inventory.
Backpacks are available from merchants in several of the major towns. Sterno and other users confirm that they do stack. Purchasing one from Gorhart takes you to 80 and buying the one in Ysa bring you to 90, and so on.
The following vendors sell backpacks:
- Rikka Egest (at The Corner Shop in Gorhart)
- Riona Helt (at Asker's Alley in Ysa)
- Wil Donall (at Main Hall of Scholia Arcana in Rathir)
- Senecer Macit (at Domus Politica in Adessa)
- Illyn Doldran (in Mel Senshir)
- Ampelio (at Idylla Market in Idylla, in the Teeth of Narros DLC)
Since backpacks don't show as inventory items, you can't use them to increase your stash, unfortunately.
I've run around picking 3 up so far and im up in 100 slots so yeah it stacks :)
Use a hex editor to edit your save. Here's a tutorial.
Edit: Sorry, I didn't quote anything in my previous post but thank you for politely pointing that out :) I didn't quote anything because 1) I wasn't sure I could even post without an account and 2) the quote would have been quite lengthy. I'm not great with the whole "coding my posts" to make cool links, but I appreciate you taking them time to do that for me.
I hex edited my save today (I'm on PC by the way) and I currently have a max inventory of over 10 million. I'll try to come back and provide a screenshot for proof, but it's already past my bedtime :P The link I provided doesn't seem to be getting around much on the internet so I thought I'd share it here. I also realize I'm a bit late to the party (two months after the last post in here), but this is by far the best solution out there; if you don't consider hex edits cheating.
I hope my comment was useful for you guys. I figured my brief statement and the link were a clear and concise way of relaying the info. Please think of the content over the format before down voting my post into oblivion. I only posted it here to get the info out to you guys.
Happy gaming two legs!