alright - chimming in on the safety factor here - and from one who totally enjoys complete saran wrap mummification....
hours in this stuff would be considered highly dangerous - do some research!
your body will dehydrate at an excelerated speed.
hopefully the one on the outside will have a pair of safety scissors handy - for that just in case need to get you out quickly.
remember - the cavities needed to breath (mouth and nose) need access of some type to air. this can be obtained with a tube or by simply leaving the mouth and or nostrils exposed. (for those that enjoy a little breath play - nummy!)
support should be used i.e. a whipping post, support beam, etc - if encasement is desired in the standing position. you will eventually start swaying and losing balance.
just keep safety at the forefront!!!!!!
so - what can play can be incorporated once wrapped? *grin* canes, knives, watersports, breath play, mind f**ks, etc.