Help me build a set up

i have a baby Boa in a 20L terrarium/Tank, UTH, water bowl, and a hide all the reg stuff, but...

I want to switch to a tub set up. Here is my main concern is the rubbermade-ish containers i saw at Target only clamp down/lock on the far ends...and i was messing around with the two sides where there are no clamp things...it seems like it would be easy for my baby boa to escape from the tub.

Anyone ever have a Boa escape from a tub when the clamps have been "locked"?

You can use binder clips to pinch the lid and lip together. Also you can use something like a luggage strap or bungee cord as an extra safety device to help keep the lid on, if you choose, but they really aren't needed unless you are using a longer tub over about 28". For anything less than that, using 2-3 binder clips per side will work...