For international readers, that's:
1 handed = ~1.3kg
2 handed = ~2.7kg
Zweihander = ~4.5kg

Other measurements:
Thinkpad P14 laptop (approx 1.6kg / 3.5lbs)
1 handed = 0.8 Thinkpads
2 handed = 1.7 Thinkpads
Zweihander = 2.8 Thinkpads

Average cat (~4kg / 8.8lbs)
1 handed = 0.3 cats
2 handed = 0.7 cats
Zweihander = 1.1 cats

Tin of Heinz Baked Beans in Tomato Sauce (420g / 0.42kg /0.93lbs)
1 handed = 3.1 tins of beans
2 handed = 6.4 tins of beans
Zweihander = 10.7 tins of beans