Sounds like The Witcher 3 update 1.07 will solve inventory problems

Update 1.07 "should please a lot of people"

***Update***

CD Projekt RED has released a list of "key changes" coming with The Witcher 3: Wild Hunt patch 1.07, confirming it will indeed address player inventory. Check out the list of noteworthy changes coming with the next update here.

***Original***

So The Witcher 3: Wild Hunt's highly anticipated update 1.07 hasn't released yet, but clues from community lead Marcin Momot reveal that it will contain something that "should please a lot of people."

While patch notes haven't yet been posted, Momot went on to suggest that the update could address one of the game's biggest issues — the inventory system and space management. Granted, nothing he has said explicitly confirms such speculation, but he did respond to someone's question "Is storage chest coming with this update?" rather suspiciously…

"I know but I can't say. Sorry *wink*"

I find it incredibly hard to believe Momot would have that sort of response if the update didn't address such a problem. 

Last we heard, update 1.07 (update 1.06 on consoles) was still in the works. Momot described it as "quite large" which explains why it could be taking a while to release.