LOVE this trash can combo.  I am using the front (black) bin for organic garbage and the back, smaller one for landfill garbage... they are plenty roomy and I wouldn't want more than they hold to sit inside my house for very long anyway.  The installation was easy and the rollers works so smoothly.  I guess I had pretty poor garbage solutions before because I feel so every time I use the front handle to draw out these bins and put garbage in them!