Tread Lite Gear Day Pack Liners / Food Bags
Same type as my 45l pack liners but smaller 20l capacity for day packs and as a food bag in larger packs
They have a 10 inch opening 6 inch gusset and are 24 inches tall and are ideal for packs from 15-30l which should cover most ultralighters needs. They will conform easily to larger depth packs easily with far less loss of space than a non gusseted bag. 21g each
They are not dry bags as the top is open but I've never had a problem with water ingress. Simply put moisture sensitive items like sleeping bag and clothes in the bag, add other items and roll the top down or tie off the top as pictured .
They also tape or tie up really well if you want to store gear in something to keep dust and muck off at home but easily see what's in the bag.
COMPLETELY FOOD SAFE UNLIKE MOST LINERS
PACK OF 10 
