hmm dunno what are you using, but my ArkInv is working perfectly, suites my needs very well, I like its powerful configuration features. And I didnt notice any bloatness in it
I should probably mention that to me, 'bloated' sometimes just means 'way too many features that I don't need'. I can reproduce the rules for my needs easily in Baggins. As far as the bags disappearing, there are several folks who've mentioned it in the thread.
Don't take it personally, please. I used to use it myself, and if it suits your needs, wonderful! :)
Previously used ArkInventory which is nice and has all the features you'd need I think but is (or was at least) quite heavyweight. Now I just use Blizz bags but I do use Skinner to make things look a bit nicer.
I also use BankItems which lets me look at bank and bag contents including alts all in one place. Kinda nifty.
I like baggins best so far. It isn't exactly want but closest, which is allow me to have stuff sorted in a way that I can really quickly find it. Specifically quest items and item rack gear and craft consumables separated from the rest is invaluable in saving any tedious visual browsing. Virtual stacks to reduce clutter is also a great thing.
Bagnon. It's simple, without bulky extras like automatic sorting or categorization. It lets me view my bank, my alts' bags, and my alts' banks from anywhere. It has enough options to make it fit my needs without ruining the functionality's simplicity. It has item quality coloring and fast searching. My only complaint is that it doesn't use the Blizzard artwork.
BaudBag as it allows me to group the bags as I want, i.e. my warlock has his soul shard bag split off as a separate bag whilst the backpack and other bags are grouped as a single large bag. I also allows be access to my bank contents offline and can use the Blizzard artwork which I happen to quite like.
I use Baggins together with Baggins_ClosetGnome because I like to have my stuff categorized and I also like to see what items belong to what itemset quickly, so I that I don't accidentally sell, destroy or disenchant my stuff that belong to other than my mainspec item set. Even though Baggins isn't perfect, this feature keeps me using it(although I don't know if other bag addons support this). I don't like Baggins' Anywherebags plugin at all and sometimes it shows stuff in more than just one category even though it's quite clear they should be just in one(some quest items show in trade goods too even though there's not any other use for them that the quests). This could be easily fixed by tweaking the category's but it doesn't bother that much.
When I played a hunter instead of a paladin, I didn't have multiple item sets and I used Onebag combined with Mr. Plow. It looked good enough, did the job and Mr. Plow kept it organized.
Baggins. I like the one-view sorted, and AI is just too bloated and buggy. (Yes, buggy...my bag slots just plain disappear all the time.) Baggins is less polished perhaps, but it works! I like Baud Manifest too, but prefer the actual icon view for my current inventory.
I use Possessions rather than any of the 'anywhere' mods for offline/alt inventory. I like the list and search better than actually seeing the inventory screen if I want to find something.
Used Bagnon eons ago. Someday i've switched to ArkInventory. Today i won't miss all the Rules and Options for my Categories. But indeed: AI eats most of my Addon-Memory, and i'm using many Addons. The lags which occur, when opening the Bags, or especially the Bank, could sometimes be very annoying. But i guess that just depends on my old freaky Machine ;)
I previously used Bagnon as it was simple and displayed everything in one frame. However I have used Combuctor since the first "stable" builds were released. It has the simple display that Bagnon has, yet the ablity to quickly look at just my Gear, Quest items, Trade crap, etc; is really handy when you haul around as much crap as I do (Druid, three sets of gear, skins and leather from my various victims, raid consumables). Combuctor it works, and it works nicely.