How sturdy / durable are they? Do you get more than one use out of them?
I'm really liking these plug trays I bought this year. They are super sturdy, the big hole in the bottom makes popping starts out a breeze, and the way the sides taper and the size of the drain hole is supposed to promote air-pruning (seems to work, I've had really nice root balls on everything ive potted up and no roots growing through the drain) 
Link: https://allaboutthegarden.com/products/charles-dowding-starter-pack-1
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