Very odd -- reaching beneath the flap into the backpack reveals nothing at all about the contents therein. No sign of anything recognizable: no socks, no pots, no clothes, no tools or torches, not even so much as traveling rations. In fact, reaching into the backpack clear up to the shoulder reveals only that everything seems to be out of reach within the backpack, even the sides which ought to be right there. This backpack seems to be bigger on the inside than it appears.
How much bigger? That has yet to be determined. Perhaps more can be determined by reaching farther inside. It's not hurting anything, it's just looking, and there's nothing wrong with just looking. Even if it is a stretch.