Torian I do not actually. I tend to only release mods for stable versions of the game. Reason being is that I don't even play 'RC' releases or previews. Sorry for the inconvenience.
Edit: Oh, glad it works!

do you plan to add this to the new preview? i genuinely can't play the game without this mod haha!
update; still works so fine on the preview! feel free to add it!

Magics Yes, this works in both single player and multiplayer.

Will this work on a server?

NomadicPirate Not a problem glad to be of help. ^_^ and that's ok. just whenever

Versora I just tested and it's 'Valkyrja's Store More' that's causing the issue. I will write a patch to disable theirs while using my backpack mods. Not sure when I'll upload it though.
Thanks for letting me know which mods you used. It made that really easy to track down. Cheers 🍻
PS If you like having bigger containers, I have a mod for that ➡️Increased Storage Capacity

NomadicPirate The go to backpack mods I like are Fendragon's mod and the ABCS[?] Redux. as for the modded bigger storage I had the Valkyrja's storage.

Versora Ayy good to hear! If you figure out which mod caused the issue, let me know. I could potentially write a compatibility patch to make them work together.
"Walking warehouse" made me giggle a little 😂

I did craft brand new bags. I didn't have ANY old bags with me I started a brand new world, hunted down reeds and crafted bags. Imma go through my mods. but I deleted any other bag mods. I'll update when I figure out the problem. Update: so yes, I got it working. Not sure which mod cause it to not work. But safe to say it's not friendly with other backpack/storage mods that change sizes. but do I really need any other backpack mods? lol nope. anyways I love this mod, and thanks. Now I'm a walking storage warehouse, lol

Versora Downloaded for myself and it seems to be working. (no other mods active)
This does not apply to old bags. You'll need to craft new bags.
If it's still not working for you, there is likely another mod causing the issue.

for some reason the hand baskets are not working. I have no other backpack mods. i created a fresh new world to try this out. I hav't tried making the other bags yet

IILordTempestII You're welcome! 😁

Thank you super so very much.

Dark I just tested this again with no other mods and it works as intended. It's likely another mod thats causing the issue. 

NomadicPirate I did craft new bags but there was no added slots, tried crafting several but to no avail

Dark Did you craft new bags? This mod only applies to newly created backpacks/ bags.

doesn't seem to change anything for me?

Thanks for updating i love this mod :)

Pagan_Sunburn Hallowedsoul08 IILordTempestII DraRex386 breeze108 1.21 update is here! Sorry for the wait!

PLLeeeezzzz please update one of your backpack mods soon.

edit-hand baskets got changed so there back to 3 slots lol now there eather reeds(cattails) or papyrus hand baskets

I'm not really a hoarder. I just go adventuring out of sight of my house, find a cool looking forest/hill/village/ or find a tunnel/mine/canyon, and get lost for three or four days while finding things I want/need. Even markers get tangled or lost because I took an extra left. At one time I fell down into a chasm--I kid you not--20 blocks from home, and the tree saplings I replanted the day I left were full grown orchards when I got back from a direction I had not explored yet. Yes, my in game name is !!!Lost!!!Thanks for this mod. 

PLS Update this mod, its super usefull

I too would love an update to this. Its too useful!

Sadly not working at this current version of 1.21.0. Made a hand basket and still got 3 slots.

Will this be updated for 1.21.0 and include the hand baskets to have 16 slots?

JustDavid Glad you like it!
I'm taking a little break but will be back soon. I'll keep it updated as new versions of the game come out. Or any requests for compatibility that seem logical.
Cheers! 🍻

The horder in me loves this mod. I know theres not a ton of downloads but I hope you will keep updating this mod. 

DrawnDreary 8x is up now. Thanks for the suggestion. 😃

https://mods.vintagestory.at/show/mod/20056

Could you please consider making a mod in between the 2x and 128x variants? Maybe like 8x? Would love extra space but 2x is too little and 128x is just absurd

dieing with this would lag so much

Asil With this, even just 1 basket is crazy! 😂

As someone who frequently gets lost in a forest or mine and has to leave behind gear for seeds, saplings, or rare ores, I can only say YEE (and I cannot express this strongly enough) HAW!!!

SoloBlood  jamescook Cheers!🍻

Did I every tell you you'r my hero!

yay thanks :)