While the other suggestions in this thread are better, I've bought both of the above for when I'm lazy, and they are decent. Not great, just decent. Pouches are a little small, but they're workable.
there's one set that I've bought that has bigger pouches on Amazon and the latex isn't bad.
these might be thin for the ammo you're using if you short draw, but i use even thinner for the same ammo, but with a very long draw. If you look for bands that have the sort of dragon scale pouches like the ones at the link above, they seem to be a little larger than the average.
If you can't find any you like, send me your address in a private message. I cut my own bands, but i have a bunch of pre-mades from Amazon and snipersling with pouches big enough for 7/16 . I'll throw a couple in an envelope as a gift to get you started.