Some time ago, knowing of my bag addiction, my wife gave me this massive collection of plastic bags that are apparently used to package bed linens and similar items in the store.
They come in a wide range of sizes from quite small to these massive bags that must have held a comforter or something. They are made of a tough, flexible & thick (16 Mills) clear plastic. They have a real zipper closure, the whole top opens up. I like that you can see bag contents easily.
As a result of having so many of these bags around, and thinking hard about practical matters of weight and ease of use of the kits, I re-packed our long-term kit tonight using these bags as storage modules, which I labeled in a way that will make sense to my wife if she needs to evacuate whilst I'm away.
Now, I have a bag labeled "Kitchen" and it's got eveything needed to run the kitchen from Esbit stove to dishtowels.
Similarly, I have a bag labeled "Bathroom" for sanitation stuff, and another bag labeled "Workshop" for tools and equipment and so forth. In the end, I divided the kit into the following modules, with every module in it's own zipper-top plastic case, excepting one, as noted below:
Kitchen - all items related to the preparation of food and water and management of the food prep area (soap, towels, sponges)
Bathroom - bags, bleach, toilet paper, feminine hygine, towel, toiletries
Pantry - The food in storage has been attacked by mice in the past, so this actually ended up being packed in a "Tidy Cat" 26 Lb square bucket - stores an AMAZING amount of food in next to no space. I'm still trying to figure out why my 72 hour food set (mostly MRE's and canned goods) fit in there with ample room left over.
Workshop - All the tools, ties, bags, nylon cord, folding shovel and so forth. If it would be at home in my shop, it's in this module.
Office - CDs of important infomation, copies of documents, pens, pecils, markers, a notepad, some paper clips and a few other items.
Bedroom - eveything needed to sleep the night from bedrolls to a change of clothes for the morning.
It's kind of hokey, but it works.