If you have much negative pressure it will suck the sides in. It causes the cheap seems to have pinhole light leaks are the stitching. also hard to get in and out of..
@heizen, Fixing to do a IN detailed one on Norther Lights Real Soon..... I kind of got busy with Holidays this run.. So I don't have much recorded. Didn't wanna post a crap show diary. Next one will be way better than this one..