Some other items that are recommended and can supplement the 10 Essentials are:

1.  Water treatment device (water filter or chemicals) and water bottles.

A water treatment device (filter or chemical treatment) makes water potable. All water, including that from streams, lakes, or pools, needs to be treated for bacteria and viruses in order to ensure safety. Most back country travelers carry a water filter: low end models are inexpensive and provide protection against many pathogens, but not viruses. Some more expensive filters and improved chemical treatments get rid of most health risks, including giardia and other protozoa and viruses. Treating the water reduces the likelihood of gastrointestinal diseases. Since some chemical treatments such as iodine or chlorine may leave a bad taste, many suggest mixing in a flavor to hide the taste. These include powdered lemonade or fruit drinks, Tang, Gatorade, or Crystal Light.

Water bottles are useful for transporting a water supply. You can use the filter to pump clean water into the bottle, or use a bottle to scoop up water and then add the chemicals (drops or tablets). Most any kind of bottles can be used. The Aqua Fina bottles are a popular bottle that backpackers carry. It is cheap, and light and easily replaceable.

2. Repair kit, including duct tape and basic sewing materials.

If you carry a self-inflating mattress or tent, you need to carry a repair kit for it. Many sleeping pad and tent manufacturers sale these kits to accommodate their particular product. Here’s a classic tip for carrying the basics of a poor-man’s repair kit: Wrap strips of duct tape (the universal fix-it product) around your water bottle or trekking poles so you can repair who-knows-what in the back country. A basic sewing kit is recommended to repair any clothing or backpack or other type of material that may become damaged and require a quick fix.

3. Insect repellent (or clothing designed for this purpose)

Bugs can all but ruin a trip. So protection must be taken. Your most effective options are: 1) Lotion or spray repellents containing DEET, and/or 2) Clothing that has been treated with permethrin.