That's one reason I made mine with a SEEP (Side Entry/Exit Portal). The other reason is a slight feeling of claustrophobia that only affects me when it is a bit involved to make an exit.
With the SEEP, you just toss the opening up and get out like normal. It holds a little heat in while I'm away, and when I get back inside, it closes up without any air leaks.
- MacEntyre
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