the gas masks are cool. my friend has one and we hit it one morning. it twas epic. it made my drive to work 30 minutes later much harder. but try boxing a soft top jeep. with the windows up the fabric is airtight enough to box the area, roughly ~30 m3 so very little space. smaller than many closets. i packed a stone pipe, a celebration pipe, with a lava mouthpiece actually, with maybe a gram of some kb. we smoked that and then about 10 minutes later we could barely see in the car. we stepped out with both doors open and smoke billowed out for maybe 5 minutes. and the stink didnt leave the car for several days, with all the doors and top down. quite a nice trick i would say. i couldnt imagine a blunt though. that would be a lot of smoke.