Short answer — for most hikers I recommend either the Ocean Signal rescueME PLB1 (best for ultralight/minimal packs) or the ACR ResQLink family (best all‑round PLB with extra visibility features). If you want two‑way texting or navigation, choose a satellite messenger (e.g., Garmin inReach Mini 2) instead of a PLB. (oceansignal.com)

Why those picks

• Ocean Signal rescueME PLB1 — smallest/lightest PLB, very waterproof, long (7‑year) battery storage life, 24‑hour transmit life when activated, no subscription. Great for day hikes and ultralight packs. (oceansignal.com)
• ACR ResQLink (ResQLink 400 / View / 410) — slightly larger but buoyant, built‑in strobes/homing signal, proven COSPAS‑SARSAT performance, multi‑GNSS GPS, ~24+ hour transmit life, no subscription; good balance of durability and search‑and‑rescue features. (SatellitePhonestore.com)
• McMurdo / FastFind 220 — light and simple PLB with GPS and dual frequency transmission; another good basic option for hikers who want rugged simplicity. (OceanMedix.com)

PLB vs satellite messenger — quick comparison

• PLB: one‑button SOS to international SAR satellites (COSPAS‑SARSAT), no monthly fee, designed only to summon rescue (no two‑way messaging). Batteries typically certified for replacement every 5–7 years and will transmit ~24+ hours after activation. (hikinglite.com)
• Satellite messenger (e.g., Garmin inReach Mini 2): two‑way texting, tracking, weather and navigation features, but requires an ongoing subscription and recharging. If you want to check in with people or coordinate a non‑life‑threatening problem, a messenger is often better. (Iridium.com)

Important practical tips

• Register your PLB with NOAA right away (required in the U.S.; registration is free and must be kept current). Rescue teams use your registration info to verify false alarms and speed response. NOAA’s national beacon registration is the site to use. (sarsat.NOAA.gov)
• Keep the PLB where it can be reached quickly and the antenna deployed upward (chest pocket, pack strap, etc.). Protect the activation switch from accidental press. (oceansignal.com)
• Self‑test per the manufacturer before trips, and note battery replacement intervals (you’ll have to send the unit in or replace its certified battery when it expires). (oceansignal.com)

If you want a single quick recommendation:

• Ultralight day hikes: Ocean Signal rescueME PLB1. (oceansignal.com)
• Most hikers who want rugged, highly visible rescue features: ACR ResQLink View / 400 / 410. (SatellitePhonestore.com)
• Want two‑way texting/navigation: buy a Garmin inReach Mini 2 (with subscription). (Iridium.com)

If you want, I can:

• list exact model specs (weight, dimensions, battery life) and typical street prices for the current market, or
• compare 2–3 specific models side‑by‑side for your planned trip (day hike vs multi‑day vs solo thru‑hike).