1. Quick-dry clothing.
Cambodia is a hot and humid country. Packing quick-dry clothing will keep you dry during the hot days and allow your washed clothes to dry fast at night.
2. Sturdy shoes.
Should your travels take you to Siem Reap and to the historical sites of Angkor Wat, you will be glad you wore sturdy shoes that keep your feet safe. Good shoes will let you explore the ruins and allow you to get up and down the tall stone structures.
3. Bring a cover-up.
When visiting religious temples, you will need to cover yourself out of respect. This is mainly a factor for individuals wearing tank-tops and short skirts or shorts. Prepare for this by bringing a scarf or two.
The sun can be unforgiving in Cambodia. This is especially true when exploring the ruins of the UNESCO World Heritage site of Angkor. Be sure to apply sunscreen in the morning and throughout your day, as climbing all those ruins will surely cause much of your protection to be sweated off.