The 3 litre main body is for your wind and/or waterproofs so your are ready for a long run.
The various straps and bungee cords allow you to get a snug fit across the upper torso reducing any chaffe or bounce.
1) Vest chassis
2) Adjustable straps for comfortable fit
3) Stretch fit panels for closer comfortable fit
4) 2 x adjustable sternum & diaphragm straps for optimum fit
5) 3D spacer-mesh for fast drying & breathable comfort
6) 2 x stretch mesh pockets with adjustable draw cord closure to fit fuel bottles
7) Right-hand side drop down pocket to fit running essentials
9) Mesh stash pocket
10) Internal key clip
11) 3L capacity
12) Bungee strap for compression and additional storage
13) Soft feeling binding
Fibre content: 45% Polyamide 55% Polyester