Are these adequately sized tubs for my girls?
They're all around 2000g and currently pigging out.

http://www.walmart.com/ip/Sterilite-...-of-6/17164513

The tubs I've seen in breeding racks seem smaller but the girls really have no room to stretch out in them.

Are these okay for my snakes?

Anything longer or wider is usually really tall and the lids aren't extremely secure like these are.

Sorry for such a stupid question but this year is my first attempt at breeding and I don't want to screw up.