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For hiking pack weight, aim near 10% of body weight for day hikes and near 20% for backpacking, then tweak for distance, terrain, and weather.

For hiking backpack weight, target 8–12% body weight for day hikes and about 10–20% for overnight trips.

For hiking hydration, plan 0.5–1 liter per hour and adjust for heat, pace, terrain, and altitude.

For desert hiking, carry 0.75–1 liter per hour in heat, sipping steadily and adding electrolytes on longer efforts.

Plan about 0.5–1.0 liters per hour of hiking, then adjust for heat, terrain, pace, body size, and refill points.

Aim for about a thumb’s width of space beyond your longest toe in hiking shoes to keep nails safe on descents.

In hiking boots, leave about a thumb’s width (1–1.5 cm) at the toes; keep the heel locked and the midfoot snug to stop toe bang.

Go up 0.5–1 US size in many cases; aim for a thumb’s-width toe room and zero heel lift in hiking boots.

For hiking backpack weight, aim near 10% of body weight for day hikes and about 20% for multi-day trips.

Hiking boot fit calls for about a thumb’s width (1–1.5 cm) of extra length past your longest toe to handle descents and swelling.