1. Water Filter: This is the main component, usually a hollow fiber membrane or similar filtration technology, capable of removing bacteria, protozoa, and other contaminants from water.

2. Squeeze Bag: Often included for easy filling and pushing water through the filter. Water is collected in this bag, which is then connected to the filter.

3. Syringe: Used for backwashing the filter to clean and maintain its effectiveness after several uses.

4. Straw Attachment: Allows for direct drinking from the water source through the filter, adding versatility in how the filtered water can be consumed.

5. Carabiner: Useful for attaching the kit to a backpack or belt loop for easy transport during hiking or camping.

6. Lanyard: Typically used to secure the filter around the neck or to a pack to prevent losing it.

This type of water filter kit is invaluable for outdoor activities where reliable drinking water sources are scarce, and it is especially popular among backpackers, campers, and emergency preparedness kits.