One night it was pretty late and I was very bored and felt like finding a new way to get myself off. So I looked around my room for proper materials, water bottle, condom, scissors, rubber bands, and lube. I cut off the top and bottom of the water bottle and the top of the condom (the part that holds the cum). Then I put the condom through the water bottle and pulled one end over the end of the water bottle and held it on with multiple rubberbands. Than I took the smaller (about an inch in diameter) rubber bands and place them about two inches apart on the condom. (make sure the rubberbands are very stretchable since they will need to stretch a decent amount depending on the size of the penis).
Then I attached the other end of the condom to the last open end of the water bottle and once again held it on with rubberbands. Then I filled it with lube. I turned on a porno just to hear the sounds of people getting off. I put the new device over my dick and started pumping away. Oh God! it was amazing. The condom made it nice and tight on the inside and the periodically placed rubberbands made extra tightness throughout the contraption. It got me off faster that usual and I shot one of the biggest loads I ever have in my life. It was amazing and I still make them to this day. It's wonderful being creative.