For a more detailed trek gear list, click here 

For the A B C D E of backpacking, click here  

These items will make you happy while on trek. This is based on personal experience of trekking on my own and with family.

Quick Dry towel - no lodge except the luxury ones, give you towels, and a good size quick dry towel is great to have, though you do not take too many showers on treks. 

Wet wipes - a quick pay down shower when required, and super useful. 

Dry fruits and nuts - a great snack, and light weight to carry.

Spare sunglasses - you will be surprised how many people forget their sunglasses at the last lodge a day behind

Buff - these are fantastic as headgear and scarf. 

River sandals - tie down river sandals have a good grip and good protection. You will be very happy to have it when you reach a lodge and need to air your feet. At the same time, they can double as a spare walking gear, just in case your trusted boots give way. 

Life straw water bottle - great for quick purification and let's you drink great tasting water from everywhere.. No need for tasteless iodine or chlorine purification. 

A small game. Evenings in the lodges are either for entertaining yourself and the fellow trekkers or for sleeping. Have a game handy. You will make quick friends

Toilet paper - of you like a soft wipe of the backside, take your own grade of loo roll. 

Small bags - so you can separate the dirty laundry from the clean. 

About two meters of thin rope and a carabiner or two - you will be surprised how handy these are when things fall apart. 

Silk liner - super lightweight and adds several degrees of warmth inside the sleeping bag. Also, you can always just use the liner or under the bedsheets or blankets.