What does it mean when a recycling bin is "lid fit"? - recycling bins with lids

I would therefore try to buy recycling containers for my school, environmentally friendly and what not, so I went and found it on amazon.com for a really good price, but says his "means from the cover, something unusual, such as They come with a lid or buy a lid?
http://www.amazon.com/Continental-White-Lid-32gal-Recycling/dp/B00194RO8C/ref=pd_bxgy_hi_text_b thats the link if it helps.