Ultralight pack liners! These come in two sizes, one sized for our 30-35L packs and one sized for our 40-50L packs. 
 
Two pack liners are recommended to fill the entire capacity (bottom half and top half) of the larger 40-50L packs. 
 
Very light and durable!
 
 
35L dimensions/specs:
12" x 4" x 26" 2 Mil Gusseted Bags
weight .7oz each
 
50L dimensions/specs
12" x 8" x 30" 2 Mil Gusseted Bags
weight 1.1oz each