My son has Type 1 Diabetes and has to carry a sling pack with him everywhere we go to carry his diabetes supplies. The smaller zipper pouch easily fits his Glucagon kit, ketone strips, two juice pouches, a few juice boxes, & candy for his low supplies. The larger zipper pouch carries his test meter kit, backup insulin pen, several extra test strip containers, batteries for both his meter and pump, and has more room if needed. There's a small zipper pouch near the bottom that we occasionally use for various small items, too. I have purchased this bag several times in several different colors and am pleased every single time.