Granite Gear Air Pocket Size Chart
  2X-Small X-Small Small Medium
Dimensions (in) 8x5x4" 10x6x8" 12x8x7" 14x8x7"
Capacity (cubic in) 280 550 730 980
Product Weight (grams) 29 33 40 48

These are general guidelines only, sizes are not guaranteed. But no worries, since at SunnySports we offer our exclusive PFF Guaranty