I have made this mod, because if you use many mods at once the player inventory is too small to store all items which you get from for example mining.
You probably need minetest 0.4.16 or later.

License:
Code: GNU GPLv3 for everything what is not taken from anywhere (look in README for more information)
Sound and textures: CC-BY-SA-4.0 for everything what is not taken from anywhere (look in README for more information)
Dependencies: default, wool, farming, stairs, dye, bucket, (unified_inventory?, more_chests?, xdecor?, beds?, tnt?, pipeworks?, homedecor?, node_texture_modifier?)
Download: zip, tar.gz
Github: inventorybags
Nathan.S's mod review
How to use.
1. Craft a spinning wheel
2. Spin wool
3. Craft a loom
4. Weave some yarn
5. Craft a bag
The rest is self-explaining.
To Do:
- Find bugs (done for now)