i've always put mine from the mid to near the top for weight distribution, i.e., heavier dense items go nearer the bottom.
i pack my tarp and hammock, or tent on the bottom. generally i don't compress them into a tight ball. i go for a loosely flattened shape if possible. i get tons more room that way and the weight works so much better. sorta like stacking handkerchiefs.
every pack i have allows quick access at several locations, including, of course, the bottom.
works for me. fwiw.
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