This was actually inspired from an old folktale called the Soldier and Death. In the story, a man comes across some magic items while coming home from war, including a sack which he can use to capture objects and creatures. By the end of the story the word "sack" makes Satan cower in fear and Death is too afraid of the Soldier to take his life.
The sack is a very simple, yet dangerous weapon. The wielder by opening the sack and saying "get in my sack" can capture anything, leaving it trapped and at their mercy. Anything you can think of can be captured in the sack as long as it in in full view of the wielder and relatively close to them. Nothing can escape the sack unless the wielder releases them or a hole is torn in it, which can only be done from the outside. No matter what is in the sack, the wielder will always be able to lift it with minimal difficulty. People in the sack can talk and hear the wielder talking to them but cannot otherwise affect the outside world.
No speed blitz.
Full knowledge on the sack but no prep.
You may have a team of up to five.
I start on the bride and your people start on that wooden platform at the bottom left.