Back pack

The ornamental design for a back pack, as shown and described.

FIG. 1 is a front elevational view of a back pack showing our new design;

FIG. 2 is a right side elevational view _thereof;

FIG. 3 is a rear perspective view thereof; and

FIG. 4 is a front perspective view thereof with the appendages in a preferred position for wear.

Patent	Priority	Assignee	Title
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D300474,	Feb 25 1986		Child harness
D300475,	Feb 25 1986		Child harness
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D381500,	Nov 14 1994	Mildex Pack, Inc.	Back pack
D384199,	Nov 14 1994	Mildex Pack, Inc.	Back pack
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D438712,	Apr 17 2000		Backpack in the shape of a whale
D448922,	Mar 03 2000		Decorative backpack
D448923,	Mar 03 2000		Decorative backpack
D450447,	Mar 03 2000		Decorative backpack
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D614398,	Mar 25 2005	GOLD, INC , D B A GOLDBUG	Child's backpack
D614399,	Mar 25 2005	GOLD, INC , D B A GOLDBUG	Child's backpack
D614863,	Mar 25 2005	GOLD, INC , D B A GOLDBUG	Child's backpack
D617089,	Mar 25 2005	GOLD, INC , D B A GOLDBUG	Child's backpack
D617090,	Mar 25 2005	GOLD, INC , D B A GOLDBUG	Child's backpack
D617091,	Mar 25 2005	GOLD, INC , D B A GOLDBUG	Child's backpack
D617092,	Mar 25 2005	GOLD, INC , D B A GOLDBUG	Child's backpack
D617548,	Mar 25 2005	GOLD, INC , D B A GOLDBUG	Child's backpack
D620702,	Mar 25 2005	GOLD, INC , D B A GOLDBUG	Child's backpack
D623238,	Jul 11 2008	GOLD, INC , D B A GOLDBUG	Child's backpack
D624748,	Mar 25 2005	GOLD, INC , D B A GOLDBUG	Child's backpack
D881567,	Nov 05 2019		Protective cover for bluetooth headset

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