I want to buy my CP today,few questions.

[mainbutter]

answers:

will a cb 70 be too big?

No. I have seen zero "small young snakes need small cages" with carpet pythons. The more ground space, the more height, the more hides/perches/basking spots/cage decorations that you want to provide, don't feel like you're restricted by the snake's size or age. I feel confident that a 50-100 gram carpet python would make full use of a 4 foot long cage with plenty of height, if it had plenty of attractive climbing and hiding areas.

I keep my yearlings in 2'x18''x2' exo-terras as planted vivariums. Come night time, I can find them all over their cages, and make use of every plant, hide, etc. I particularly like seeing my girl curled up in the birds nest fern

The only reason to downsize their enclosure (and they don't NEED all the space I've been describing) is if you are trying to house multiple hatchlings.

do carpet pythons need height to climb?

"Need"? no. They will eat , sleep, breed, and live long lives without substantial climbing height and perches. Will they make use of perches and height if you give them it? Most definitely, even a big 20-30lb female coastal will climb if she has something that can support her (small tree etc).

what are caging options?

A CB 70 will do a jungle carpet python for a good while. It's pretty easy to see when a snake is in need of more space, but depending on growth rates, you can probably bet that a CB-70 will last a jungle carpet python until it is a year, perhaps a year and a half old. I kept my first in a 20G long until it was a year and a half old, and then spent some money on an Animal Plastics 4x2x2 (along with a perching shelf), which was a great investment.

Just about all different "types" of caging are suitable to young carpet pythons. I wouldn't go too small as they will outgrow small stuff pretty fast, and there is no need to go through 5 different size of cages for them.