Put the old one inside the new one.....that will double the strength of the sides. We use the big plastic trashcans for our horses and they bump and bend them.....2 or 3 big trashcans one inside the other solves the problem. If it's good for horses.....it's good for your plants....

edit....I'd hope two would be plenty.......
Weedhound Reviewed by Weedhound on . Third Grow I am at Day 19 of flower in my third grow with 9 Master Kush. My bins drain completely this time around and my roots are super huge which I think I owe to the drainage. I am having some yellowing for some reason, but I just changed the res and upped the PPM to 1100 last night so hopefully they will turn around. The plants really took off in veg which I was not expecting, so I had to tie a few of the plants down to keep them away from the 1KW HPS bulb. The first pic is my whole grow area, Rating: 5