The Borona Expandable Tackle Bag is for anglers who want to pack in extra gear. The Borona comes complete with 4 Shimano 360 size utility boxes in the medium bag and 5 370-size boxes in the large. In addition to the interior storage that the boxes offer, the Borona features 4 external zippered pockets for more storage and to keep tackle items ready for immediate use. The fabric is tough 600 denier nylon and the bottom is overlaid with a waterproof bath-tub style bottom that will resist water and wear. The two level lid opens on top to reveal an organizer panel for tools and a map pocket, and to provide extra storage space for everyday tackle items. The second zipper opens the bottom section that contains the utility boxes. The divider between the two top sections is a padded pocket for more storage. The trick to the Borona is the expandable bottom. If you've filled all the interior boxes, just unzip the expander on the bottom and you can stack your boxes vertically. You can add two more boxes or opt to lay one box on top or add more tackle like reels or other bulky items. The Shimano Borona Expandable Bottom Tackle Bag is definitely very versatile, a bag that will handle all your tackle needs for a long time.