The following things are needed for trekking for a typical multi-day trek in Nepal. Most of the treks have teahouses ( Lodge) throughout while others require camping and the necessary equipment. The size of your backpack depends primarily on whether or not you have porters on your trip. Those with porters usually carry your duffel bag and you need to carry your day pack with water, snacks, a camera, and rain gear. without porters will need a larger pack to fit all of their personal supplies and sleeping bag. Certain items can be purchased in Nepal but buying critical pieces of outdoor equipment is not recommended because you can’t get the quality things needed for trekking.
 Boundless Adventure always provides rental Sleeping bags and Down Jackets for Everest Base Camp trekking, Annapurna Base camp Trekking inAnnapurna conservation area, Manaslu Trekking, and Upper Mustang trekking every trekking trails are high passes trekking trails in the Himalayas in Nepal. If you have it on your own, then bring it with you. If not, let us know when you arrive in Nepal. But, this equipment is a rant, you need to cover some. or if you feel comfortable, you can get to every trekking shop in Thamel, Kathmandu. You can get trekking shops in every corner of Kathmandu. Anyway, these are the very important things needed for trekking. Have a look at the givenlink for more details.
Trekking gears in Nepal
Sleeping Equipment for Hiking
Tent (necessary for treks with camping) but not necessary for Tea House trekking
Sleeping bag (–15° bag will suffice on most treks)*
Sleeping Pad
Silk Liner *Many nights at lower elevations will be hot, but because there will likely be a few very cold nights at a high elevation a cold-weather bag is unavoidable. At low elevations you can sleep with the silk liner only and using it later extends the life of your bag (oil from the skin is bad for expensive down).
Things Needed For Hiking In Nepal
Backpack (size depends on whether or not you have porters)
Hiking boots* (break them in beforehand)
Camp shoes (your reward after a long day)
Wool socks (bring a few pairs of varying thickness)
Lightweight trekking pants
Trekking shorts
T-Shirts (lightweight wool is great)
Underwear *You will be hiking through a wide range of terrain from mud in warm weather to snow in cold weather. The trail will be rocky throughout. The safest bet for Nepal trekking footwear is full backpacking boots, which provide good support and protection from the elements. If there is a high pass on your trek, you may be walking on snow and the conditions will be cold. A good compromise is to bring backpacking boots and trail shoes—you can use the trail shoes for camp and interchange the two depending on the conditions and how you feel.
Essential Winter Gears needed for trekking
Long underwear/Wool thermals
Sweater
Fleece
Waterproof jacket and pants
Heavyweight pants for high elevations (also good for camp)
Heavy down jacket (can be rented in Kathmandu)
Winter hat
Winter gloves
Accessories
Water purification (pump, tablets, or Steri Pen; bring from home)
Water bottles (at least 3 liters total capacity)
Baseball cap (the sun is strong at all elevations)
Hiking poles (lessen the impact on your joints)
Sunglasses (essential when you cross snow line)
Headlamp with extra batteries
Reading materials (Kindle may be best)
Journal and pens
Camera with extra batteries
Daypack (for your rain jacket, snacks, camera, etc.)
Heavy-duty duffle bag (preferred by porters)
Gators (many people wear them but they are not mandatory)
