You can put two sliders on the zipper so you can open it at any point. Not quite as flexible as velcro, but close. (Check the TravelPod
zipper pics if that's not clear.)
Long pieces of velcro are a pain to line up, IMO. Sometimes in the PeaPod I get a little "bubble" on one side and have to realign the whole thing. And that big piece of velcro takes a lot longer to close than a zipper. The velcro would be easier to use with winter gloves on, though...might be a consideration if you're putting on a winter top cover instead of a bug net.
I'm not sure about the weight - I bet a #3 zipper and 1/2" velcro are pretty close in weight. Should be pretty easy to find listed weights for that.
But velcro doesn't jam, doesn't have sliders to break, etc.
Re: velcro vs omni-tape, they both work about the same until the velcro hooks get clogged with lint. Omni-tape doesn't get snag on lint and fleece, but it will stick to itself so unbundling a wadded up bugnet might take an extra minute...no big deal.
IMO, there are as many pros to cons for zippers and velcro in this application, so it just comes down to personal preference. I'd probably choose a zipper if I were doing this.
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