Pack the lighter items on top.
1	Pack	pack	VERB	VB	Mood=Imp|Person=2|VerbForm=Fin	0	root	0:root	Discourse=elaboration-additional:27->26:0
2	the	the	DET	DT	Definite=Def|PronType=Art	4	det	4:det	Entity=(27-object-giv:act-cf1*-3-coref
3	lighter	light	ADJ	JJR	Degree=Cmp	4	amod	4:amod	_
4	items	item	NOUN	NNS	Number=Plur	1	obj	1:obj	Entity=27)
5	on	on	ADP	IN	_	6	case	6:case	_
6	top	top	NOUN	NN	Number=Sing	4	nmod	4:nmod:on	SpaceAfter=No
7	.	.	PUNCT	.	_	1	punct	1:punct	_
