I just got my DT3 and was wondering how to load it for training purposes. I tried a sleeping bag and a 25 pound weight but the weight fell to the bottom and sort of just rolled around. I am brand new to back country hunting and my first hunt will take place next year. I have some gear to gather yet but really want to start training with pack now. just not sure how to load it. I saw Aarons video on how to load a pack but not sure what everyone uses to fill the pack for training.