Here is what happened last time on The Legends Of The Time Traveller
Sarah and I are standing in my lab talking about going to the shaft that she has discovered. I agree to go with her and take the flashlights to charge them. Terry brings the two girls with him so that I can explain to them not to say anything about what we overheard. Once I get the flashlights to the charging station, I return from my room with my backpack. Dr. John is waiting for me in my lab, and we start talking.
I start to fidget with the strap of the backpack and say to Dr. John;
"Backpack?"
"Yes, Michael. The backpack on your back."
I stand up straight to project some confidence and say;
"It is for my work, Dr. John."
"Oh. Do tell me."
"I can not afford to waste any more time by walking two or three times to get stuff that I need. So, by using my backpack, I will only have to walk once, and that ensures that I am spending less time outside of the lab and more time inside."