For budget-friendly running packs, I'd consider looking into Decathlon's Kalenji line. They offer practical packs that don’t skimp on comfort, even for longer hikes or urban explorations. Features to prioritize would be a snug fit with adjustable straps, breathable back panels, and a hydration compartment if you plan on longer activities. I’d avoid packs that don’t have a chest strap, as they can shift around quite a bit. Another tip is to check out sales at outdoor retailers or look for second-hand options, which can often lead to some great deals. Are there specific activities or destinations where you think you’ll use the pack the most? That might help narrow down your options.