Sardines? Yes sardines... if you buy a covering to small winter proof tent that's the way you will feel, like sardines in a can!
So the first step start's with a very primary question of what is the quantity of individuals who will be resting in the tent? In general for purchasing a big outside camping covering that wide range would be 5 to 6 individuals or more. Take for an example, in my loved ones we have 2 adults and 4 kids so we need a huge close relatives covering. The regular comfortable ground area needed per individual is about 30-35 sq ft. So for my loved ones we would need a covering with 180 sq ft. of ground area... which would be a 15x12 covering.
Also this goes turn available with the dimensions of the covering which is it's internal size. Not just in the middle of the covering but the over all place within. With some of modern big camping tents a 6' great individual can simply take a outdoor camping tent position directly up in just about every inch of the covering. The 15x12 covering I mentioned has a middle size of 7' 4" so as I am 6' 5" I can take a position directly up just about every where within the covering even in the corners.
2. Privacy, Not Outside...Inside!
Next thought is if you want some convenience. Now remember you won't get much after all you are in a covering... but you can buy camping tents that have 2 or 3 areas. Some are just easy display dividers while others are more private. Based upon on which covering you choose you can have an area for mom and dad, an area for the children, individual areas boys /girls etc., an area for all your equipment... lot's of choices available. Most of the huge close relatives camping tents made nowadays have built in areas or a way for making a couple of areas or more... some even outdoor traveling tent have shelves and closets.