Laos operates on 230 volts at 50 hertz. Wall outlets accept two-pin round European plugs and two-pin flat American plugs without grounding. A universal adapter with surge protection handles both configurations. Power outages occur weekly in Vientiane and daily in provincial centers including Phongsali and Attapeu. External battery banks rated at 20,000 milliampere-hours charge smartphones four to five times. Hotels in Luang Prabang and Vang Vieng typically provide power sixteen to twenty hours daily. Guesthouses in Luang Namtha and Xam Neua may operate generators from 1800 to 2200 hours only. Bring two charging cables for each device because replacements sold in Laos use non-standard wire gauges that fail within weeks.
The Lao kip trades at approximately 20,000 kip per US dollar as of 2024. ATMs in Vientiane dispense maximum 2,000,000 kip per transaction with fees of 30,000 to 50,000 kip. Machines in Pakse and Savannakhet limit withdrawals to 1,000,000 kip. Thakhek has three functioning ATMs and Phongsali has one that runs out of notes for days at a time. Businesses throughout the country accept Thai baht and US dollars under twenty dollars for direct payment. Bring a canvas money belt worn under clothing because hotel safes in provincial towns use three-digit combination locks that open with systematic testing. Divide cash into three separate locations within luggage. Credit cards function only in hotels rated three stars or higher and restaurants in Luang Prabang's UNESCO zone. Carry small denomination kip notes because vendors at morning markets and bus stations cannot break 100,000 kip notes.
Temperatures in Vientiane range from 15 Celsius in January mornings to 38 Celsius in April afternoons. The Bolaven Plateau drops to 10 Celsius at night during December and January. Phou Bia's summit reaches 5 Celsius before dawn in winter months. Pack clothing in layers using merino wool base layers that dry within four hours when hand-washed. Cotton fabrics remain damp for twelve to sixteen hours in Laos humidity levels that average 75 percent year-round. Bring three lightweight long-sleeve shirts in synthetic fabrics that block ultraviolet radiation. Laotians consider exposed shoulders and knees inappropriate in all settings outside swimming areas. Women visiting Pha That Luang and Wat Xieng Thong must cover shoulders and wear skirts or pants extending below the knee. Men wearing shorts above the knee face denial of entry at Wat Phou and Wat Si Saket. A cotton sarong measuring two meters by one meter costs 40,000 kip at markets and serves as temple covering, beach towel, and sleeping sheet.
Footwear requirements change every few hours during normal daily movement. Temples including Wat Mai Suwannaphumaham and Wat Si Muang require shoe removal before entering any structure containing Buddha images. Slip-on sandals with ankle straps eliminate the need to tie laces fifteen times daily. Hiking trails in Nam Ha National Protected Area and Dong Phou Vieng National Protected Area contain mud sections thirty centimeters deep during rainy season from May through October. Boots with ankle support and aggressive tread prevent the twisted ankles that end multi-day treks. Bring boots one-half size larger than normal to accommodate swelling that occurs after six hours of walking in tropical heat. Trail runners with mesh uppers dry faster than leather boots but offer no protection against leeches that attach to skin through fabric. Socks made from merino wool prevent the fungal infections that develop within three days when wearing synthetic socks in constant moisture. Pack five pairs of socks because laundry services in guesthouses return items damp.
The Mekong River and Nam Ou River boat journeys from Luang Prabang to Luang Namtha require six to eight hours on wooden benches without backs. Inflatable seat cushions sold as stadium seats reduce the nerve pain that develops after three hours on untreated lumber. Boats provide no shade and reflected sunlight from water increases ultraviolet exposure by 25 percent compared to land-based exposure. Bring a wide-brim hat that ties under the chin because wind at 40 kilometers per hour during dry season pulls unsecured hats into the river. Sunscreen rated SPF 50 or higher requires reapplication every ninety minutes during boat travel. A lightweight long-sleeve sun shirt with UPF 50 rating eliminates the need for sunscreen on arms and torso. River spray soaks passengers in the front half of boats during fast water sections. Store electronics and documents in roll-top dry bags that close with three folds and a buckle clip.
Mosquitoes in lowland areas including Vientiane and Savannakhet carry dengue fever year-round. Anopheles mosquitoes transmitting malaria concentrate in Attapeu province and along the Xe Pian River. The insects feed primarily between dusk and dawn. Apply DEET-based repellent at 30 percent concentration to exposed skin every four hours after 1700. Permethrin-treated clothing remains effective for six weeks or thirty washes. Spray application covers pants, long-sleeve shirts, and hats with permethrin at 0.5 percent concentration. Allow treated items to dry for four hours before wearing. Guesthouses provide mosquito nets with holes from cigarette burns and torn corners. Inspect nets before dark and repair gaps with duct tape. Battery-powered mosquito coils emit smoke that repels insects within enclosed rooms but lose effectiveness in outdoor restaurant settings. Sleep in air-conditioned rooms when available because mosquitoes cease activity below 16 Celsius.
The dry season from November through April produces dust that enters lungs and coats contact lenses. Unpaved roads connecting Vang Vieng to the Plain of Jars generate clouds of laterite particles that remain airborne for thirty minutes after vehicle passage. Disposable N95 masks filter 95 percent of particles above 0.3 microns. Bring twenty masks for a two-week trip because each mask becomes clogged after one day of use. Contact lens wearers experience irritation from dust penetrating the gap between lens and cornea. Daily disposable contact lenses eliminate the need for cleaning solutions and storage cases. Pack three times the normal supply of lenses because replacements are unavailable outside Vientiane. Eyeglasses with transition lenses that darken in sunlight reduce the need to swap between prescription glasses and sunglasses. Bring a backup pair of glasses because frame repairs require return to Vientiane where one optometry shop operates near the morning market.
Water from taps in every Lao city contains bacteria that cause diarrhea in foreign visitors within twelve to forty-eight hours of consumption. Bottled water costs 5,000 to 8,000 kip per liter depending on location. A portable water filter using hollow fiber membranes removes bacteria and protozoa to 0.1 microns. Squeeze-type filters process one liter in ninety seconds. Gravity filters that hang from trees process four liters in five minutes without physical effort. Bring replacement filter cartridges because the devices clog after filtering 1,000 liters of turbid river water. Ultraviolet light sterilization pens kill 99.9 percent of pathogens in clear water after ninety seconds of exposure. The devices fail in murky water from the Mekong River where suspended sediment blocks ultraviolet penetration. Water purification tablets containing chlorine dioxide require four hours to neutralize viruses in tropical temperatures. The tablets add a chlorine taste that dissipates after thirty minutes of air exposure in an open container.