4Monster Foldable Waist Bag with Adjustable Strap, Portable Bum Bag Super Lightweight, Water Resistant Fanny Pack for Men Women Outdoor Hiking Running Travel Camping Sport

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Product Description

bum bagbum bag

The Start of 4Monster

Aug. 2015

It all started on a camping trip to Yellowstone National Park. While four senior outdoor enthusiasts get together,the conversation took an unexpected turn to the subject of outdoor gears. Our friend brought an awesome travel backpack. We agreed that it was very beautiful and functional, but cost a lot. A question came to our minds: Why don’t we make some practical, stylish and lightweight outdoor gear? After camping, our trip leads us to Big Sky City in Montana. Lying under the starry sky, we decided to build a functional and stylish outdoor brand.

Sep. 2016

We started with quick-drying towels and backpacks. In this year, we did various design draft and material testings. After many twist and turns, we finally resolve the basic prototypes of our original towels and backpacks. We received a lot of valuable feedback from many outdoor enthusiasts which we would like to thank to.


4monster was born, based on technical materials, and with the latest design, we are committed to creating a “portable” outdoor products brand, with minimizing size, but also aesthetic, durable, practical and fashion.

4Monster Co-funder& General Manager ——–Gary & Eddy

waist bagwaist bag

Multipurpose Foldable Waist Bag

·Portable fanny pack for running and cycling

·A fashion travel chest bag

Specially designed for outdoor and travel, the fashionable portable fanny pack with secure storage is perfect for most people who love the outdoors and sports.


fanny bagfanny bag

running beltrunning belt

fanny packfanny pack

Durable Sewing and Material

We double the sewing and use 30D nylon to make sure the bum bag won’t be easily ripped. It can be used for a long time. But please be careful to keep it away from fire!

Water Resistant Design

Sometimes the rain just falls without a sign, and watersport is getting popular these days.

Most waist pack only use waterproof nylon, but water can still penetrate the backpack through the gap of the zipper.

We use YKK waterproof zipper instead of a normal zipper, now the daypack gonna protect your things from any rainfall and water drop.

Portable and Lightweight

Small until you open it!

Weightless than a phone, put it in your pocket easily without any burden.

Why not have an extra waist bag during the trip?

waist bag womenwaist bag women

Big Storage Space

Durable waist belt adjusts to fit waist sizes 40-130cm

Multi separate compartment1 Hidden zipper pocket1 Keyholder

The main pocket fits all smartphone and wallet

30D Waterc-proof Nylon Microfiber fabric, 85% polyester & 15% polyamide Microfiber fabric, 100% polyester 20D 380T nylon, W / R waterproof coating Microfiber fabric, 80% polyester & 20% polyamide Microfiber fabric, 80% polyester & 20% polyamide

Key Features
Portable,Water-proof,Light Weight Soft,Smoothy,Strong Water Absorption,Fast Drying Soft,Smoothy,Strong Water Absorption,Fast Drying Warm, Lightweight, Portable, Durable, Water Resistant Portable,Strong Water Absorption,Fast Drying Strong Water Absorption,Fast Drying,Soft

Hiking,Camping,Traveling,Beach,Daily Use Gym.Camping,Traveling,Beach,Swinming Pool, Sport Gym.Camping,Traveling,Beach,Swinming Pool, Sport Outdoor, Indoor, Camping, Hiking, Travel and Picnic Beach,Camping,Swimming Pool,Traveling, Hiking, Backpacking Swinming,Beach,Camping,Traveling,Daily Use

Product Dimensions ‏ : ‎ 15.49 x 15.49 x 11.94 cm; 60 Grams
Date First Available ‏ : ‎ 9 Nov. 2020
Manufacturer ‏ : ‎ 4Monster
ASIN ‏ : ‎ B08MZL64VY
Country of origin ‏ : ‎ China

【Water Resistant Material】The portable bum bag is made of water-repellent material, and uses water-resistant zipper to ensure that rain and water will not wet your items through the zipper gap.
【Durable】Durable and tear-resistant 30D nylon can effectively protect the fanny pack from being damaged by keys, branches, small stones during mountain climbing or traveling, and extend its service life.
【Multipurpose】Both portability and practicality are guaranteed. There are a total of three pockets in the waist bag to provide you with enough storage space. The bag contains an inner bag where you can store valuables such as credit card and mobile phone. And there is a special key ring for you to store your keys.
We want to make sure you have an amazing experience with us. 30 day no hassle returns / free exchange,12 month warranty.We make sure you’ll have nothing to worry about.


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