Heavy duty water resistant canvas. 
Material - 95% polyester/ 5% PVC
Hydrostatic Head 3,000. (Light rain) Please always ensure your important items are in either a dry bag or zip-lock freezer bag for extra protection as there is no guarantee rain won't get in.
Dimensions - 10x9.5in 
Weight 300g with back panel/ 241g without backpanel.
Comes with standard One size 8x6in mesh back panel with 4x adjustable Polypropylene 18in webbing with quick release buckles. The straps can be cut to size - see video on straps.
2x waterproof zippered panel access with detachable zip extenders.
Mesh front pouch 4.5x4.5in.
2x external webbing loops on the front for things like carabena's/ Garmin etc - see video on how to attach your Garmin.
Internal pocket 6.5x5.5in for small things like keys, card & money.
Pole attachments at the base. (Compatible with folding poles only - see video) for quick stowaway whilst eating/ scrambling/ walking etc
Elastic in the centre of the base to stow away the pole attachments when not in use if desired.
4ltr capacity.
NB - Dimensions/ weight & material may differ slightly for each chestpack.