I have lockable wrist cuffs and ankle cuffs
Straps and a blindfold
And of course rope

I have performed a few self-bondage scenarios
In one I froze the lock key in a block of ice
and then locked my wrists and ankles together in front of me
I almost didn't get free before my husband came home

Another scenario; I drank a lotttt of water and then climbed into a large plastic trash bag
I climbed into our bathtub then wrapped an old belt that was several sizes too small around my waist and of course around the trash bag
I locked the belt by putting a lock through the buckle
I was not going to be free of the belt or the bag until the key was freed
Then I sat down waiting for the lock's key to become free from the ice block
Of course I was also waiting for the inevitable emptying of my bladder that I knew would come since I drank so much water
I did my best to rub myself while I waited for the ice block to melt and for my bladder to empty but it was very difficult