Is it possible to cook a meatloaf using clear glass Pyrex containers? Still trying to restock my kitchen pans after my recent move and am on a budget, but what I do have is as set of clear pyrex, that looks about like this set: http://www.amazon.com/Pyrex-6021224-Storage-10-Piece-Clear/dp/B00005B8K5/ref=sr_1_1?s=gateway&amp;ie=UTF8&amp;qid=1285775513&amp;sr=8-1 

My question is can I use it to cook a meatloaf? If I cannot use it to cook a meatloaf then have you ever cooked a meatloaf on a cookie sheet without it falling to pieces and/or burning on the bottom?
I see no reason you couldn't use that Pyrex set for a meatloaf - I've used glass casseroles for meatloaf before (so glass in general is no problem), and that set says the bowls are oven safe.

As for the cookie sheet method, I would be afraid of it falling apart as you described, but if you were to go that route, I'd recommend wrapping it in aluminum foil to help it keep its shape.