I am going to the Gulf Coast to field herp and want some sort of cheap enclosures for animals that I capture. I only plan on keeping the animals for for probably an hour or up to a day. I have been trying to figure out an idea for a cheap easily portable enclosure. So far I have only found a vivarium made by Exo Terra called a flexarium but it is not sold in the US and only comes in very large sizes. So I have been thinking about some sort of home made vivariums. The main problems i need to over come are ventilation and a need for being secure. My main idea right now is air tight Tupperware with the top part replaced with piece of screening. I like this idea mainly because of how cheap it will be, they will be stackable but they will mostly be small, this might be nice for frogs, small lizards, snakes and salamanders but wont work well for anything larger and turtles. Any tips/ ideas?