First you need a plastic bottle that will fit in a 1lb coffee bag. Cut the top off - save or recycle the rest.
The top will go inside the coffee bag to help with water drainage and to get air to the roots.
Now you need a coffee bag. I cut the top off of mine to make it shorter, but you don't have to.
Cut some drainage holes along the bottom. Hard to see in this photograph so I circled it. I do one on each side.
Put the bottle top in the bag cut side down. Add dirt and your plant.
Great for herbs and probably strawberries too. I added a bit of coffee grounds to the dirt. with the bottle lid in the bag they do sit fairly flat, but can easily be blown over in a wind, so I'm using a basket. You could also anchor it to a wall as long as you're using light weight plants. The bags themselves are pretty sturdy. Inside they sit fine on a shelf.