Back pack

The ornamental design for a back pack, as shown.

FIG. 1 is a perspective view of a back pack showing my new design;

FIG. 2 is a rear elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a right side elevational view; and

FIG. 5 is a bottom plan view.

Patent	Priority	Assignee	Title
6394328,	Nov 09 1999	SILVER GOOSE, INC	Reversible backpack
6655564,	Apr 05 2002		Back strap
D260697,	Nov 19 1979		Back pack
D354849,	Apr 26 1993		Combined book bag and carrier
D392798,	May 31 1995	Jansport Apparel Corp.	Backpack
D403853,	Oct 07 1997	DART INDUSTRIES, INC	Backpack
D404909,	Jul 13 1996	DR ING H C F PORSCHE AG	Backpack
D413016,	Jun 03 1997	JANSPORT APPAREL CORP	Backpack
D415888,	May 29 1997	JANSPORT APPAREL CORP	Backpack
D415889,	May 29 1997	JANSPORT APPAREL CORP	Backpack
D480866,	Jun 26 2001		Backpack with rear tunnel
D529679,	Jun 09 2005		Multipurpose bag for utility carts and the like
D616196,	Jul 17 2008		Shoulder bag for carrying an oxygen tank
D665573,	Sep 20 2010	Vitec Holdings Italia SRL	Backpack
D694001,	May 27 2011		Backpack
D699031,	Oct 12 2012	Target Brands, Inc.; TARGET BRANDS, INC	Backpack
D794947,	Feb 17 2016	Mansur Gavriel LLC	Backpack
D798043,	Dec 21 2015	VALENTINO S P A	Bag
D830053,	Jul 26 2017		Backpack
D842603,	May 11 2017	Tommy D Electrical Products, LLC	Backpack
D843712,	Nov 12 2015	RYU APPAREL INC	Backpack
D844974,	May 10 2017		Backpack
D849399,	Mar 23 2018		Backpack
D872991,	Jun 15 2018	Thule Sweden AB	Backpack

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