The Delta consists of a press studded flap and drawstring closure which keeps the elements away from your delicate equipment. It is also aimed at giving you extra carrying capacity when you need it. As the name suggests, it was created to fit our bags that have Delta shoulder slings. It can also be attached to a belt or Waist Strap Attachment . The Delta is lightly padded with closed cell foam and has two press studs on the top flap. We've also added a useful flap feature to the body of the Delta where you can place your fingers, so you don't have to press on your delicate kit at the point where the press studs close. The inside of the Delta is made of the same soft nylon material used for the linings of our bags and it features the same closure method as the AVEA (also worth looking at if you need a smaller pouch). Delta pockets will fit the following models: 225, 335, 445 and 555 plus the 107, 207 and 307 (two will fit onto a bag if you wish).