I am growing in grow bags this year, since our soil is rocky and has a lot of clay. I have never had such growth with my tomato plants! I will have to try tomatillos.
Have you ever tried bale planting? I keep strung straw bales around the base of my run all winter as a windblock/insulation. By Spring, they're pretty well broken down, and make really great planters.
You can use new ones, but older ones are better. To plant one, make sure the bale is sitting lengthwise, with the strings running around the outside (like barrel rings.) Figure out the spacing for mature plants. We have big bales, so we can fit three, sometimes four plants across.
Using a hand trowel, open up spaces along the top end, Drop in some good potting soil, just a bit if your bales are well broken down, more if they're new. Put in your plants just as if you were using a flower pot or garden bed. You may have to water them more than you would ground-plants, at least at first, but they should adapt easily.
This works really well for most vegetables and even flowers, although we learned the hard way that the bales aren't stable enough to support really big sunflowers. We didn't even have to stake the tomatoes We just planted one good plant in the middle and let it crawl over the top and cascade over the sides. It was pretty impressive.
At the end of the season, just haul the whole thing to the compost pile and break open the bales ... you'll have green matter, brown matter and "hot" matter all in one fell swoop!
Happy Gardening!