Re: tub lids.... how do u latch them down if you have no rack?
you can also drill holes through lid and tub and use twist ties (a pain if you're accessing frequently).
i use sterilites to transport my giants, i have 10 holes in each with 14g wire ties twisted to hold them closed. however, you might want to be safer than sorry; one got out even with the ties, and decided my bed would be her hide for awhile, and wouldn't have it anyother way (got the marks to prove it, lol).
there are also tubs that have clamping sides, wich are more expensive and much more rugged than the common storage tubs. these are preferable if you have no racks; 2-3$ more per tub gives you the security of KNOWING your animals are still there.