Question about cage size?

[Rober10169]

Thanks. The lid does have clips so not worried about them pushing off the top. Will have to use a top light with that cage

[guidofatherof5]

Thanks. The lid does have clips so not worried about them pushing off the top. Will have to use a top light with that cage

Pushing off the lid would not be my first concern. Having babies climb the glass and work themselves into small places would be mine.
Those mesh lids are notorious for not fitting flush/flat. They were designed to keep larger animals in, not baby/small garter snakes.
If I may make a suggestion. Most of these aquariums have an inner lip just below the top. Most hardware stores/outlets sell a screen making kit.
Purchase one and make a screen that fits on the inside lip. If you make the screen correctly (not too tight screen material) it will fit nice a snug and won't allow and escapes, injuries or hiding places.
Just a suggestion.