Paper bags aren't the problem. Your wraps are.

A plain paper bag is fine for lunch if you keep moisture off the paper; cotton fabric bags are usually worse, not better.

The sogginess isn’t the bag’s fault. It’s from condensation and wet food. If you toss in a sandwich loosely wrapped in plastic or a freshly rinsed apple, the paper soaks it all up. Fix: wrap the sandwich in wax paper or parchment before it goes in. That keeps moisture at the food instead of the bag. A paper towel at the bottom also absorbs the occasional drip.

Wet stuff like yogurt, cut fruit, or dressing needs its own leakproof container — even a repurposed glass jam jar works. And don’t pack berries straight from the strainer. Dry them first. The bag is not the problem; the packaging around the food is.

If you want reusable, get a fabric bag with a waterproof lining — PUL, nylon, or waxed canvas. Plain cotton canvas is basically a sponge. A lined bag does protect better than paper because it won’t disintegrate, but it needs wiping out, not tossing in the wash.

A paper bag with a wax-paper-wrapped sandwich is still the most reliable version of this.