"Toddler Proof"... now there's an unobtainable standard.... good luck getting the peanut butter off of your sensor
I opine that kids have been screwed ever since DVD players came along; you could fit a grilled cheese into a VHS easily enough but now they're lucky if they can get a greasy tortilla in there!
You see, this is where we differ from kids, we have lost the capacity to believe it will fit in. Beliieve me a grilled cheese will fit in a dvd player.
And now, this really got me thinking, why are Canon lenses not made of grilled cheese and peanut butter. They could then claim their lenses to have a higher nutritonal value than the competing brands and I'm sure it could help wildlife and bird phootographers get closer to their subjects. It would be a situation where everybody wins!