The best thing to use is plastic wrap. Saran Wrap and all the others are the same plastic. It can be fused togeather easily, and will not withstand much pressure before bursting. This method is kind of like making a Seal-A-Meal package.
To seal the plastic wrap, cut a piece and fold over. Use aluminum foil folded in half. Sllip the plastic wrap edges that you need to fuse into the aluminum. Heat it with a regular clothing iron on high. Don't let the iron touch the plastic directly, just use it to heat the foil. Let it set for about 10 seconds after you remove the iron. The plastic will be fused togeather. After you have the pouch closed on three sides, put in the amount of blood you need. You will need to use a small block of wood to seal the last edge without spilling it. Let the pouch with blood sit on the counter, and put the open side in
the foil on top of a wooden block, then heat with the iron. You will have a blood pack made to the size you want, and it will burst easier than a condom. It will also be pretty flat, and easier to hide under clothing than a condom with a couple feet of tape on it.
