When I first started tube-feeding all I received was an IV pole. My insurance company then refused to pay for a feeding backpack. That's when I realized that any backpack can be tube friendly.
In the next few days I am planning to add more infos and photos on my backpacks and waistpacks....
... well that never happended :-). Will try and add more info soon, until then here's a link to a previous post on using waist packs:
I own quite a few waist packs now - a (tube)girl gotta have accessories to choose from :-). My favourite is by Jack Wolfskin: "Swift"
Holds up to 700 ml of formula and is very comfortable on my back and hips.