I keep an old swiss m32 canteen in it and that gives me room to keep an orange hunt vest emergency blanket pocket knife handkercheif bic lighter and a small hank of 32 bank line in it as well

The stainless canteen cup fits under the nalgene just fine and in the pouch i put in a ziplock bag wetfire tinder a small pocket knife a bic lighter water purification tablets and a small emergency fishing kit