I was once stopped at the register while purchasing the components to build a poop tube. The manager was called over. I was interrogated with the assumption that I was building some type of pipe bomb. They pretty much decided I was building some type of bomb without ever asking me what I was assembling. I will never forget the expression on the employes face when I told them what I was doing.
If you or someone you know is in the medical field they can get their hands on some suction canister solidifier. Turns liquids to solids and sanitizes it in the process. Poop then add some in the poop tube - actually peeing in the tube some helps. Turns everything into a solid, sanitized mass. Your poop tube / container should be disposable.
It was at Mcguckins in Boulder too. I was really surprised that they did had not seen a poop tube before. Granted this was 20 years ago. Sir....I plan on pooping in a paper bag and then placing said poop bag in this tube. The dudes look was priceless and I think he thought I was the crazy one.
Mac is on the money.........some containers are wide enought to drop it right in........ don't forget to add something to keep the furmantation down...like r v blue stuff or others mentioned above.....peanut butter or mayo in the large size have a large lids .........do wrap plenty of duct tape around container