Hello, when I try to open backpack without placing nothing happens, when I have a tool in hand and shift-wheel with backpack in hotbar just selected slot is changed, I can't place sleeping bag if tall grass (double or single) is found in that direction. ABP 0.8c for 1.7.10

The default key for backpack opening is "B". If you have Baubles installed this overwrites it. Try installing NotEnoughKeys and changing your keybinds.

You need at least 3 tools for the scrolling to work, two in the backpack slots, and one on your hotbar. Weapons do not count as a tool.

As for the sleeping bag issue, it would serve you better just to place in a 3x1 open area. To my knowledge and sadness, this mod is dead.