1. OutdoorMaster Sling Bag - Small Crossbody Street/Travel Backpack for Men & Women (Gray) (Click Link to Check Price on Amazon)
Editor's Rating : 8.9 out of 10
SMALL YET SPACIOUS SLING BAG FOR MEN & WOMEN - OutdoorMaster Sling Bag is a versatile & compact backpack - Perfect as travel backpack, carry on luggage or street/urban style daypack!LIGHTWEIGHT SINGLE STRAP / CROSSBODY DESIGN - Made of a lightweight canvas like polyester material & featuring a spacious main pocket, this bag can hold a camera, iPad or a small laptop computer (up to 12").

2. Under Armour Compel Sling 2.0 Backpack, Black/Black, One Size (Click Link to Check Price on Amazon)
Editor's Rating : 9 out of 10
UA Storm gear uses a DWR finish to repel water without sacrificing breathabilitySoft lined laptop sleeve-holds up to 15" laptop

3. 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 (Black) (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.

4. DDDH 13.3-Inch Sling Bag Riding Hiking Bag Single Shoulder Backpack For Men Women(Grid black) (Click Link to Check Price on Amazon)
Editor's Rating : 8.9 out of 10
★High quality nylon material,fashion,multi-function and practical design are comfortable to wear.★Size:11.8*5.2*15.7inch(L*W*H).With a long crossbody adjustable strap can be used as a messenger,chest bag or shoulder backpack.(We also have bigger one,fit 15.6 inch laptop)

5. East West U.S.A RT525 Tactical Molle Assault Sling Shoulder Cross Body One Strap Backpack, Digital Color/Black (Click Link to Check Price on Amazon)
Editor's Rating : 9.8 out of 10
3 zippered front, 1 zippered main, 1 zippered hydration rear pocket, free American flag patchMOLLE straps, D rings, single padded strap