Transparency--being able to see the bottles and cans in the container--works on multiple levels. It gives abundant visual cues to the user, and it lets the custodian know when the bag is full. With a small hole on top, there's very little chance that these will get filled with trash.
The first one is a bit flimsy, but handy for events. It can be obtained at http://www.cleartainers.com/index.asp.
The second photo was sent to me by a NJ municipality that makes these out of PVC pipe. Sand is put in the lower portions of the piping to increase stability. If you want the specs for this, email me from the "about me" box in the right column of this blog.
The last photo shows a "Cannable" (on the left), which is a sturdy version one can buy. They can be used with or without clear plastic liners.