The Boonie 30 Liter Rolltop Backpack is constructed of durable, fully waterproof 600D TPU material. The Boonie backpack has been tested to protect against rain, snow, dust and even odor with an approximate rating of IPX6. Constructed of a durable 600D TPU exterior shell with welded seams this rolltop bag delivers unmatched performance for adventures like cycling, rafting, hiking and kayaking.