ADJUSTABLE BUCKLE & ELASTIC HEM: This cover offers a customizable fit for various backpack sizes upto 45ltrs. Whether you have a small daypack or a large hiking backpack, the adjustable buckle ensures a snug and secure fit, preventing the cover from slipping off during use. Equipped with an elastic hem, this cover provides a tight seal around the edges of your backpack, further enhancing its water resistance. The elastic hem ensures a secure fit while allowing for easy installation and removal.