We use a range of technical fabrics for our bags and our bag liner is orange 210T.

CORDURA (500D/1000D)

This is the benchmark outdoor gear fabric and are used widely in military applications. Waterproofing coat on the inside of the fabric, with excellent strength and outstanding abrasion resistance. 

XPAC™

Xpac™ fabric is was originally designed as a high performance racing yacht sail fabric. It's an extremely strong non woven fabric, made of three layers bonded together.

VX-21 is less abrasion resistant, but more waterpoof & lighter than Cordura.