*APPLAUSE*
My lettuces are doing great; the spinach is being eaten by mice which SHOULD be asleep by now, but it’s been so warm, they’re not!
Glad you’re giving this a try. I’ve really enjoyed winter growing the past few season. :)

I used your method this spring-and planted stuff really close. Ate the initial greens as baby spinach etc. When the weather got warmer, I transplanted what was left.
The little gem made a really nice tall romaine type lettuce. So it worked really well, but the big sacks were hard to manage and hard to fit into the area I had — could only get one going.
Each of the containers is deeper which I think will help, and I basically will have double the growing space. Each container will use half of the big bag of soil — and I can lift half a bag pretty easily. I have 4 of these containers and room for 2 or 3 more.
My shoulder is still recovering from lifting heavy stuff above my shoulder when I was organizing the food I had canned. So I’ve gotta admit that age means you need to be a little more judicious with the weight lifts. Ha.