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18 oz bladder measure
added: 2016-04-12 after being moderately desperate i empty 18 oz of urine into a flask. i probably could have lasted a bit longer but wanted to empty to go to bed. however knowing the container was under me i accidentally started going about 2 seconds before i intended (around 3 and 4 seconds where you hear me go then stop for a second). i want to try with a fresh morning start and surpass my record. sorry for the sound poor quality, but the gushing sound is great.
