The same as a standard twin size mattress. I used a standard-size twin sheet on mine.

YES, But i would keep a blanket or a sleeping bag on top of the bed and you should be fine as cats like to claw things. Also I always put an extra sleeping bag under my bed as i am a heavy person, and that way i dont have any problem with rocks or anything else pokeing a hole in bed when i am camping.

yes... this one on the internet dosent come with a pump and the 1 in the store does. the pumps are like $15-$20 extra

yes i think it is good for kids, i had my 4 yr old grand daughter sleep on it

even though i have not tried it as a double twin but can use it that way it does lock together.

i had 2 adults and a 4 yr old appx total weight would be 250 or more

A twin sheet fits perfectly fine on this bed. The sheets I bought are just slightly big on it but don't slip off even with kids jumping and playing on it.

I am happy with the Coleman Rechargeable Air Pump. I'd suggest getting any of the 3 colemans: 1 is a/c, so pretty much just for the house, 1 is car, but then you have to fill up your mattress next to the car, and the other is the rechargeable battery: it's heavier and slighly bigger, but it worked great! All have attachements for coleman beds and thinner ones that should fit nearly any other bed.

It is very easy to fold - you just put them on top of one-another and fold in thirds/fourths and slide back into a bag. If you don't suck out the air, just opening the vents do totally deflate over about 15-30 min on their own.

No it doesn't I bought the Coleman battery operated one at Wal-Mart and it filled it up in about 2 minutes