I have a few natural ground blinds I put together but I also take camo blind material with me to hang it there as well if needed. The key is to be still & to face the wind and not the sun. You can't move if they look your direction but must be patient for them to look away before you move a muscle. I also carry and use a rest like Awshucks described made from an alum. crutch cut off yet its adjustable and it has camo tape on it also. The Xbow can rest comfortably on it and it willalready be pointed where I anticipate the deer will be when they get there.

I also own a "doghouse" blind but its kind of crowded with the crossbow but not bad with a rifle. I also mark with rocks or sticks the yardage so a rangefinder doesn't have to be used.