I've been using Military surplus bags for a while..... for clothes, cooking gear, food, survival stuff, first aid, etc.
Specifically....... the Tanker Tool Bag, Mechanics Tool Bag, and the Individual First Aid Kit (IFAK).
The tool bags are made out of thick, durable canvas...... the IFAK is made from some sort of nylon that seems to be equally durable.....
The Tanker Tool Bag is perfect (for me) for clothes...... I only carry a couple extra sets of clothes for a trip...... no matter what the length..... I don't change my outfit every day.....
The Mechanics Tool Bag is good for..... well..... tools...... and also canned goods and cooking utensils...... it also makes a good bread bag...... you can keep it in a safe place so your hot dog buns don't get smooshed.....
The IFAK is good for..... well..... first aid stuff..... silverware, spices (salt and pepper), one of those tiny stoves, canister for said stove..... matches, TP, etc...... I have one that carries a Zippo lighter, fluid, flints, a wick, magnesium firestarter, and several Fatwood sticks..... to get a fire going in bad weather......
The best part about MilSurp bags is that they are relatively cheap...... built well....... and available new on Amazon!
https://www.amazon.com/Rothco-Canva...20976834&sr=8-1&keywords=tanker+tool+bag&th=1
https://www.amazon.com/Rothco-G-I-M...20976834&sr=8-2&keywords=tanker+tool+bag&th=1
https://www.amazon.com/MOLLE-Coyote...words=individual+first+aid+kit+pouch+military