Jute bags can be stacked higher than HDPE bags because they are

Jute bags are first of all eco-friendly, biodegradable, and made up of plant products so they will be less harmful to food grains also it is made up of strong natural fibre.
And for stacking purposes in the storage godowns, jute bags can be stacked higher than HDPE (High-Density Polyethylene) bags as jute bags are less slippery than plastic bags.