I made this black silnylon day pack which weighs 4 ounces. I use it everywhere, including all these day hikes in Zion National Park.
I can carry water bottles, rain clothes, tarp, survival in a can.
I found, however, that when the pack was loaded, those straps dug into my shoulders. Without a hip belt and forgoing the fannypack as pack rest solution, I realized a hybrid pack was in order.
I took a store bought day pack that I'd bought at Walmart a couple years back. It was lightweight, but the color, fabric and multiple zipper pockets was not ideal.
I cut off the straps from the silnylon pack, and sewed the remaining bag directly to the back pad, incorporating the hip belt and sholder straps of the walmart pack. I added a silnlyon bag for the front water bottle.
End result, a pack that weighs 12.4 ounces, and rides perfectly on my hips. The weight disappears.
Bottom line, shoulder straps and decent hip belt make life much easier.