I just love Redneck Engineering.It's a pretty tight fit on the discharge chute but it still came off if I hit a tree or made a tight turn to the left so I added a lanyard with a key ring. The key ring is threaded through the bag and the lanyard is hooked to the pin that holds the discharge chute on.
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It's a woven bag so it lets the air out as the clippings go in. As soon as the bad deflates it's full and time to empty. I just tip it up and dump the clippings on the ground in a central location then come back with trash cans and a rake to pick them up. Works better than I expected lol.
Now to just figure out when the compost is done... dunno never composted before.
JT
As for composting, my edumacated guess (never did it either) would be when it turns that dark loamy color.