客人邮件如下： There is however work necessary on the cover before I can give my ok! The bottom cannot (!) stay this way with this fabric! It needs to be neoprene because of insulation reasons. I send you the scetch I sent Cherry.
So: what's the function of the neoprene/rubber on the bottom of the cover? There are several: 1. heat insulation - keep heat inside better on the bottom side, and keep cold of floor off when laying the cover/pack on the floor for use with feet. 2. dirt protection: when lying on the floor, should be cleanable with a wet cloth 3. glide-stop: when lying on the floor should prevent the pack from sliding away To be able to do this, I think it needs to be a 1-2 mm thick neoprene sheet, sewn to the outside-bottom of the cover!
Please do see how fast the factory can make a sample cover with neoprene sewn on the bottom to send me a picture as well.