Easy to medium skills. You need yarn (Viking: Alpaca Maya is Super bulky, 5-6 wpi. You need 300 grams, 960 meters or 1050 yards for the smallest bag. Or Sandnes Garn Easy, also Super bulky but heavier, 5-6 wpi. You need 1350 grams, 1358 meters or 1485 yards for the biggest bag) and crochet hook 7 mm. Two sizes, the smallest is big enough for four bottles of wine.