If it matters, here is Tina's testimony describing Cooper working with the chutes and lines:
Interview 11-30 Mucklow: Mucklow states that at takeoff from Seattle the hijacker was in seat 18-D or 18-E, occupying both seats at various times, and she was seated across the aisle in 18-C. Mucklow states that at takeoff the hijacker was using several seats and was occupied with opening one of the parachutes and attempting to pack the money in the parachute container and attach it to his body using the parachute (container’s) straps. Mucklow recalls that the parachute was a bright pink-orange color. Mucklow’s description is somewhat vague but she says he removed a small jack-knife from his pocket and he cut some portion of the outside container or the parachute in order to secure the money in ‘this’ rather than in the white cloth type bank bag which had been furnished him. She says that she did not see him tamper with the two large parachute containers other than to generally inspect them when she brought them aboard.
Interview of Mucklow 12/1-2 at her home in PA: When Mucklow returned to the plane with the last back pack chute, she saw that the hijacker had one of the small chutes open and was cutting nylon cords out with his pocket knife. He took the nylon cord and wrapped it around the neck of the money bag numerous times and then he wrapped it a few times from top to bottom, and with the same piece (of cord) he made a loop like a handle at the top. This nylon cord was pinkish in color. He appeared irritated that they hadn’t given him a knapsack for the money as requested, and after trying to put the money in an unfolded parachute, he decided to leave it in the canvas bag (and fabricate a holding line for that, instead).
Approximately four minutes after take off he stood up and told her to go the cockpit and close the first class curtain, and for no one to come back behind the curtain. The lights were out in the rear compartment and she went forward, faced the curtain, and turned around and looked and the last time she saw him he had a nylon cord tied around his waste and he was standing in the isle. Before she secured the curtain she called back and pleaded with him to take the bomb with him or disarm it before he left.
1. opened and cut cord from only one of the 'small chutes'.
2. tried to fabricate containers using (a) the bank bag, and (b) one small chute container.
3. had a nylon cord tied around his waste.
4. did not tamper with the two large parachute containers.