I'm looking for standard heavy duty 10x20 propagation trays, but the problem is that the ones you see advertised(ie: Amazon) are all listed as "heavy duty" or "extra thick" and those claims are usually false. So I'd like some personal recommendations for trays that are thick enough to not bend or twist easily when they are loaded up. And if you have the thin flimsy ones, please let me know their brand name so I can avoid them.

John

Proptek trays don't bend and are thick and sturdy. They are more $$ but they will last for many years. I got mine at Hoss Tools

https://growhoss.com/products/162-cell- ... 9312005430

The best I have seen are from Sili-seedlings. They carry 1020 aluminum trays. I love their products and use the silicon pots for starting seedlings, especially peas, pole beans and edamame.
https://www.sili-seedlings.com/shop/sta ... -1020-tray I used to also get strong plastic ones I think from Greenhouse Megastore. Will update when I find it. The Megastore carries both with or without holes. I used to get solid green ones from another store but after a few years the plastic dries out and they start to crack. Maybe these black ones will be OK. Will see if I can find the green ones. But check these:
https://www.greenhousemegastore.com/pro ... 3414722759

I purchased these last year from Greenhouse Megastore:

https://www.greenhousemegastore.com/pro ... 3414886599

They have three different strength trays. This is the "middle" one. They worked great for me. Not one crack all of last season. I'll see how they do for season #2 this year.

If I invest in any additional carry trays or inserts, 1 would switch from black to white or one of the fun colors to help keep plant roots cooler. I haven't seen any trials to confirm this but they do cook roots to a fault. In the mean time I'm doing my initial seed bulk seed starting in take out containers and old perma-nest carry trays. I have to hold myself back from buying a shed just to hold my collection of Greenhouse Megastore containers purchased (and hoarded) over the years.

- Lisa

@Gardadore Did Silitray used to make aluminum 1020s? SS is all they have on their site currently, damn they look sweet though.

Sorry I didn’t pay attention to your post carefully. The trays are stainless steel, not aluminum, which I prefer anyway.
I have a lot of the silicon pots and love them. Their products are good so let’s hope the stainless steel trays prove to be just as good. Good luck and please update your experience as I have never ordered them but am considering it.
This link takes you directly to them.
https://www.sili-seedlings.com/shop/

The trays are the first thing on this link.

Ah, no shipping options to the islands. Guess I’ll stay in plastic like the rest of the hoi polloi.