1. Mansov Travel Backpack Amusement Water Resistant Hiking Bag 35L Adult Series (Click Link to Check Price on Amazon)
Editor's Rating : 9.2 out of 10
COMPACT DESIGN: Folds into zippered inner pocket to fit anywhere, and avoid overweight charges. Unfolds from pocket to backpack. Smoothly move in every tripVARIOUS USAGE SCENARIO : Ultra lightweight, unzip it when you reach your destination free fellings. Use it as a carry on for your excess baggage, perfect for day trips, vacation, travel, day hikes, school, camping, shopping, climbing

2. WATERFLY Chest Sling Shoulder Backpacks Bags Fashion Cute Crossbody Rope Triangle Pack Rucksack for Hiking or Multipurpose Daypacks and School Handbag for Man Women Lady Girl Teens (Army Green) (Click Link to Check Price on Amazon)
Editor's Rating : 9.6 out of 10
WATERFLY focal on outdoor rain and snow proof bag.Ultralight weight(0.5 Pound) make you easy to walk on winter.Strong YNS buckle,Dilated shoulder strap and Padded back of the bag is designed for autumn and winter.

3. Coreal Large 35L Lightweight Packable Travel Hiking Backpack Green (Click Link to Check Price on Amazon)
Editor's Rating : 9.4 out of 10
The backpack is made from highly rip and water resistant nylon fabric, provide strengthen and long-lasting performance with minimal weight. It's roomy enough for your hammock, clothes,towel, journal,and a couple beers if need be,etcUnfold size 21.56" x 11" x 7.87",Folds into 9" x 7" Small Slim Pouch with Carrying Handle & Weighs only 0.77lb with 35 Liter of Space - More convenient than a duffel or tote.

4. G4Free Large 40L Lightweight Water Resistant Travel Backpack/foldable & Packable Hiking Daypack(Dark Blue) (Click Link to Check Price on Amazon)
Editor's Rating : 9.8 out of 10
High CAPACITY: Larger than other packable backpack! 40L! Large enough to carry what you need in the trip,It's roomy enough for your hammock, clothes,towel, journal,and a couple beers if needed,etcHANDY AND LIGHTWEIGHT: It fits into an ultra-compact pouch. Easy to folds up into small pocket. So you can easily pack it in your suitcase, purse or car and have an extra bag without it taking up.

5. Mardingtop 45L Water-resistant Hiking Daypack/Camping Backpck/Travel Daypack/Casual Backpack with Rain Cover for Outdoor Climbing School-5458 (Purple) (Click Link to Check Price on Amazon)
Editor's Rating : 9.9 out of 10
MATERIAL- Polyester , Breathable mesh shoulder straps ,Water-resistant Polyester as the fabric do not allow water to easily penetrate.RAIN COVER not included.CAPACITY- 45L (2,746 cube inches)