Characteristics:
        Cordura
        Zipped pockets
        Adjustable nylon straps
Adventure 16 Chief Dogpack- compression straps, two-layer nylon mesh back creates pocket for
leash, taped seams, angled at front of pack to prevent rubbing, blue and forest, $47. 
Adventure 16 Rover Dogpack- Saddle style with two straps at back, red, blue, forest, $33.
Available at eWalker.com , Searchgear

Bison Designs

Characteristics:
        Cordura, w/ brush guard
        Open back with three adjustable straps
        Elastic harness
        Drawstring collar and storm flap on pockets
        Optional fleece lined harness pad
        Taped seams
        Pack is square in shape
        Long Haul- Available in Red
Available at Bisonbelts

Bitchin’ Stichin’

Characteristics:
        (Material unknown)
        Solid back
        Quick release buckles 
        D-rings for extra gear
        Pack is square in shape
Priced at $25 to $30
Looking for a Source

Black Sheep, Inc.

Characteristics:
        Cordura
        Two straps at the neck to adjust fit
        One or two straps at the belly (various by size of dog)
Self repairing zipper
Pack is square in shape
        Available in red, blue, and green
Priced at $20 to $34
Available at Drs Foster and Smith

Caddis Pet Products

Characteristics:
        Heavy duty nylon
Mesh yoke
Vinyl reinforced bottom
Three adjustable straps with quick release buckles
Pack is square in shape
Available in blue
Priced at $30
Available at Pets Warehouse ,  RC Steele

Caribou

Characteristics:
Cordura
Solid "power" mesh back panel, cut back away from shoulders
Quick release buckles
Zippered pockets
Angled away from the elbows to prevent rubbing.
Available in Red, Cobalt and Spruce
Woofer $28 to $34
Available at Caribou.com ,   Campmor

Characteristics:
Cordura
Clips on to any  standard harness (not supplied)
Zippered pockets
Angled away from the elbows to prevent rubbing.
Available in Blue, Red, Green, Purple
Woofer $30 to $32
Available at Valley Vet

Characteristics:
        Heavy material
        Load centered over shoulders
        Removable saddlebags over non-restrictive harness
        One chest and two belly straps
        Velcro closures on bags
        Available in small sizes
        Available in red, other colors are special order
Priced at $25 to $65
Available at Dog Scouts of America

Dogstuff

Characteristics:
        Cordura
        Vest design for stability with fitted neck, shoulders, and chest
D-rings on top
        Side release buckles with padding
        Zipped pockets
        Many colors available
Wanderer *Daypack, $41 to $59
Weekender-Larger for longer trips with compression straps, $35 to $74
Cross Country- With two water bottles in holsters and water dish in pocket on back, $67 to $86.
Shockwave-Smaller pockets, with detachable top bag, rides higher on the body, $72 to $86.
Wilderness Traveler- Extra padding, D-rings for top loading, tie down strap, detachable top
bag, reinforced front and bottom, compression straps, comes with repair kit, $135 to $163, top
bag, $48 to $55.
Looking for Online source

Granite Gear

Characteristics
        Cordura
        Open back with adjustable straps.
        Fleece lined sides.
Two padded straps
Zipped pockets with storm flap
Taped seams with reinforced stress points
Rounded in front to prevent rubbing of the elbows.
Available in Red, Forest, and Royal
Ruff Rider- priced at $45 to $58 
Available at REI , Caribou Cry ,   Paddlers.com ,   Bentgate ,  Granite Gear The Adventure Source

Kyjen's Outward Hound

Characteristics:
        Extra strong nylon
Removable saddlebags
Adjustable straps with padded buckles
        Quick release leash holders
Key holder in pack 
Square shaped packs.
Priced at about $45
Available at Petsmart

Lazy Pet Products

Characteristics:
        Magnum fabric
Mesh harness
Lined with synthetic sheep skin on all contacts points
Nylon straps with quick release buckles
Zippered pouches
        Pack is square in shape 
        Available in red
Pouch Pack- priced at $23 to $37
Looking for Source.

Lewis and Clark (currently not accepting orders)

Cordura
Completely adjustable
Fits like a vest
Available in Red, Black, and Orange
Priced at $45
Available at SARdog

Mountainsmith

Characteristics:
(Material unknown) 
Open back and three adjustable polypro straps across the back. 
Three adjustable straps at shoulder, hip, and chest 
D-rings on top and "Inner Sanctum" pocket for additional gear.
Compression straps to stabilize load forward on the shoulders.
Moveable yoke to prevent pressure points.
Pack is square but the back straps can be adjusted to prevent rubbing at the elbow. 
Priced from $59.00 to $79 
Available from Mountainsmith  , Planet Outdoors  , Snow Leopard

Neo Paws

Characteristics:
        Waterproof neoprene construction
Lightweight
Hook and loop closure
Double layer mesh lining
Reflective trim
Price at $46-$50
Available at Neopaws

Nordkyn

Characteristics:
        Cordura
Solid back panel
Quick side release buckles
Shape of pack unknown 
Available in red, royal, navy, orange, and black
Traveler- ballistic material on front panel, extra padding, D-rings for tie downs, reflective
tape-$60
Doggie Daypack *delrin snaps on cinches, plastic zipper- $35 to $45. 
Available at Nordkyn ,  Dogworks

Outdoor Products 

Characteristics:
        Cordura
Loose mesh back panel
Angled bags 
Available in red, blue or green
Fleece buckle padding
zipper- $26 to $30. 
Available at REI ,  Outdoor Products

Characteristics:
        Cordura
Solid back panel
Contoured neck
Rectanglular bags
Available in black, red, blue or green
Fleece buckle padding
zipper- $45 to $65. 
Available at PetSmart

Pack Shack

Characteristics:
        Cordura
        Expands into a tent
        Available in Forest Green, Royal Blue, and Red
Priced at $120 to $130
May be out of business. Looking for online source.

Raven's Watch

Characteristics:
        Waterproof nylon
Square shaped pack
Priced at about $17
Available at Raven's Watch 

Characteristics:
        Packcloth
D-rings for lashing
Quilted fabric back panel
Zips together for human shoulder bag use
Priced at about $50
Available at Real Boss  , Drs Foster and Smith

Rocky Mountain K-9 Accessories
Characteristics:
        Cordura
        Built in harness
        Quick release fleece padded buckles
        Rides high above the shoulders
        Includes 2 water bottles, water dish, leash, etc.
        Available in blue
Trailblazer Pack priced at $89 to $99
Available from Rocky Mountian K9 ,  G and M Sales  , Colorado Petfitters

Characteristics:
        Cordura with double reinforced bottom
        Exterior gear cord.
Built in harness with grab handles
Polar fleece padded straps at chest ribs and belly.
Self repairing zippers.
Compression straps to stabilize the load.
Reflective trim
Packs are square in shape. 
Available in Red and Greend Fleece lined sides.
Two padd
Palisades -detachable saddlebags and a hydration system -$100 to $125 
Approach - $62 to $70
Day Tripper- $40
Available at Ruffwear ,  Gear2Go , Colordao Petfitters ,  Sierra Surplus

Characteristics:
        Cordura
        Mesh back panel
Quick release buckles with fleece padding
Front of pack is contoured to prevent rubbing
Available in black and red
Priced at $24 to $32
Looking for source. Company may be gone.

Characteristics:
        Cordura 
Fits like a vest
        Ventilated mesh top with attachable cover
        D-rings for extra gear and pulling 
Distributes weight over shoulders
        Easy adjusting side fasteners
        Wide front chest band
        Four tailored compartments, with Velcro fasteners
        Available in Burgundy Red, Forest Green, Orange and Camo
Priced at $56 to $69
Available at Sylmar Dogwear , Searchgear , Cabelas

Walkies

Characteristics:
        Cordura
        Built in harness with two leash attachment points for walking or pulling
        Fleece lined
        Open weave back
        Quick release buckles
        Heavy zippers
        Taped seams
        Available in red, blue, and dark green
Priced at $62 to $70 from backpacks 
Urban packs are $32
Available  at Colorado Pet Fitters. Bugaboo Sports

Wenaha

Three pack types are offered with the following basic characteristics:
        Cordura with ballistic brush guard.
        Solid back panel.
        D-rings for extra gear. 
        Padded front canvas yoke. 
Pack is constructed to ride forward on the shoulders.
Three adjustable straps with quick release padded buckles.
Zipped pockets
Less angled at the front near the elbows. 
Available in red, and green. 
Small sizes available.
Explorer II- compression straps and detachable saddlebags-$26 to $70. 
Standard- packs not removable- $31 to $55. 
Jogger- detachable saddlebags, water bottle holder, mesh pockets, no D-rings- $ 30 to $50.
Available at Dogworks ,   Mainely-dogs, Campmor  Rei ,   Nordkyn , Moorepet , K-9 Power Products ,  Perry Greene  , Chinookwind Outfitters , Doggone Good

Four pack types offered.  All have the following characteristics:
        All packs are constructed of water resistant Cordura.
Solid back panel is broad to distribute weight, with contoured neck and handy zipped pocket. 
Extra gear can be attached to the top with lash patches.
Two quick drying straps, with padded side release buckles. 
Storm flaps over YKK zippers.
The pack is angled in the front to prevent rubbing at the elbows. 
Available in red, forest green, and royal blue, and other colors while supply lasts. 
Small sizes available.
Banzai- Compression straps keep the load forward on the shoulders, ballistic nylon brush guards
that double as an outer pocket and reflective trim-$74, 
Reflector- similar to Trekker with reflective trim-$59,
Trekker- lightest weight-$54. 
Saddle Bag- light use, small, one size-$45.
Prices from   Wolf Packs ,  www.halcyon.com/randk/, Chinookwind Outfitters , Nordkyn

Other Packs

Pet Solutions 1-800-737-3868 (discontinued their dog and cat line, but have 5 or 6 packs left)
Nylon and corduroy
Mesh harness
Synthetic sheep skin lining at contact points
Quick release buckles
Pack is square in shape
Available in red
Priced at $21-$35

New England Serum 1-800-637-3786 
 Nylon and nylon mesh
Quick release buckles
Pack is square in shape
Comes with leash and bowl
Staff is very helpful
Priced at $43

Eagle Creek 
Discontinued, but they may be available at EMS

Denali
Couldn't find a site with these packs.