They are undoubtedly the best of the best when it comes to storage. You can stack them, bend them, drop them, submerse them in water and their contents will usually come out unscathed. Indeed they are the king of the storage box world. But even a king has his weaknesses. Plastic storage boxes are terrible for the environment and possibly your health. They can outright KILL small children and did I mention they are bad for the environment? Read up on more interesting facts about plastic storage boxes right here!

First the good:
  Plastic Storage boxes can be stacked or placed on other less-than-robust (in my experience) shelving units that allow for a very tidy and organized house or garage. Their unique shaped lids allow for appareled stability when compared to other kinds of storage boxes. Only the weight of the contents within really limit the stacking height.
  While Rubbermaid seems to be the go-to brand for plastic storage bins, there are a wide variety of not-so-well known brands that offer more features and at a reduced cost. To store my smelly solvents and engine parts in my garage, I frequently use bins that have tabs on either end that clip the lid on. This holds the lid secure and prevents any smells from escaping.  Bins that offer an airtight seal are always preferable over the alternatives. it's just one more option that could come in handy later on down the road.
  Plastic storage boxes offer incredible strength for their size and weight. Thanks mostly due to their molded structure, and also due to the durability of the plastics used in the construction. Be wary of cheaper thin plastic boxes as they can crack or even shatter if the plastic is too brittle.
   Just like you should keep an out for water and air tight boxes, keep an eye out for bins that have eyelets where you can put a lock through. being able to lock your storage boxes allows for some peace of mind if you've got kids or questionable characters unsupervised in your house or yard.

   Plastic storage boxes are terrible for the environment! the plastics used to make them will NEVER degrade or take another form. Plastic is so durable that it just doesn't break down. Furthermore, the toxic chemicals used in plastic containers are very bad for you. For your regular storage needs, these chemicals are of little concern, but if you have any edible items or even clothes stored inside these containers, those chemicals can migrate from the plastic into your food and onto your clothes. This is especially true if the storage boxes are subjected to heat! You can check to see if the type of plastic used is safe or not by reading the Recycling logo and the number inside it. Use this guide to decide for yourself: Plastics and Carcinogens
   Finally any small container that children can climb in and get stuck are dangerous. The large plastic storage boxes available can quite easily trap small children if they are playing around. The lids often snap on very tightly and there is a serious potential for danger. Be aware!

  So now you've got a pretty good idea of what to look for when shopping for plastic storage boxes. With this knowledge you should have no problems finding the appropriate product to meet your storage needs!