Colanders with lots of holes, not big holes and not necessarily the expensive ones that only have patterns of holes.
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former Community Editor
A quick search on Amazon pulled up a number of options for plastic colanders that don't collapse, like http://www.amazon.com/Kitchenaid-Classic-5-Quart-Colander-Red/dp/B005D6G4L0/ref=sr_1_4?ie=UTF8&qid=1397502961&sr=8-4&keywords=plastic+colander or http://www.amazon.com/Chef-Craft-5-Quart-Colander-White/dp/B0021Y9O1O/ref=sr_1_2?ie=UTF8&qid=1397502961&sr=8-2&keywords=plastic+colander.