Almost every gear question we get at the trailhead comes down to three things: what is on your feet, how much water you brought, and how much weight you are carrying that you did not need. Fancy kits photograph well. Comfortable basics finish the class.
Tread matters more than brand. Slick-soled fashion sneakers slip on dry, loose fire road in Los Angeles and on wet roots outside Portland. A road running shoe is fine for a flat park session, but mention it at check-in and your instructor will keep you off the rocky sections. Broken-in shoes beat brand-new boots every time. If your feet are still forming hot spots on a short walk around the block, those shoes do not belong on a trail class yet.
Sixteen ounces covers a 60-minute park class. Anything with sustained climbing wants a full 32, especially Dallas greenbelts in July and the open coastal bluffs in San Diego where there is no shade to duck into. Mexico retreat days are the only sessions where we suggest a hydration pack instead of a bottle. Soft flasks and hard bottles both work. What fails is the tiny fashion bottle that empties before the overlook.
Full-size studio mats, camera bags, hard-sided jugs, and anything you would have to set down mid-hike. Instructors carry the route plan and the first-aid kit. You carry you. If an item only exists for after the class, leave it locked in the car and collect it when you get back.
Open overlooks in Los Angeles, Dallas, and San Diego cook faster than the forecast suggests. Bring sunscreen you will actually reapply, and a hat if you burn. Coastal mornings in San Francisco and Portland can feel cool even when the sky looks clear, so a light windbreaker earns its weight. The goal is one layer you can strip or put back on without unpacking half the bag.
Los Angeles classes often mean exposed fire road and bright overlooks. Dallas leans hot and humid on greenbelt miles. San Francisco rewards grip over fashion on damp mornings. San Diego is mild until the bluff wind hits. Portland stays cooler under the canopy. Mexico retreat mornings start cool and finish warm, which is why the retreat column in the gear table looks heavier than a Thursday park class.