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Trap's hot air. You need a good seal around the glass.
Water won't boil in it, but after a few hours on a sunny day you can get it up to pasteurization temperature at least (165F).
Step 5. How to keep flaps in place. Don't they teach you anything in engineering school? Duct Tape, duh! sooner or later everything develops a deficiency of duct tape. You don't need the other universal problem solver: WD-40. But you could substitute 550 cord (or twine if you insist) for the duct tape, because... I'm betting you don't own any of it.
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