Bigger isn't always better and size doesn't really matter according to Adam Ashley-Cooper, the surprise new heavyweight in the Wallabies backline.

In the weeks leading up to the Tri-Nations tournament, much has been made of the fact Australia's backline lacks the size of past years and is smaller than their two southern hemisphere rivals.

In the middle of the last decade, Australian selectors had the luxury of choosing up to five 100 kilogram powerhouses in their backline.

At their disposal were fullback Chris Latham, wingers Wendell Sailor and Lote Tuqiri, centres Stirling Mortlock and Morgan Turinui. Conversely, none of the current Wallaby backs tip the scales into three-digit territory, with Ashley-Cooper the leader at 96kg.

"It was a little (surprising) because I never considered myself to be the biggest guy in the backline," Ashley-Cooper said.

"But I think that's just the way the game has changed, how the backline has evolved.

"I think there are other backlines out there that have a bit of size, but I think the way the game is going I think you've got to have that fitness and agility and speed rather than the sheer size.

"But it's always nice to have someone who weighs in triple figures who is able to get you over that advantage line all the time."

Ashley-Cooper wasn't looking to add that extra bit of bulk which would push him into the triple digit club.

"I'm pretty happy with my weight, I think it's the perfect weight to change between the centres, wing and fullback if I have to."

Ashley-Cooper's history with the Wallabies suggests he need never get too comfortable in one position.

In the space of his first eight Tests, the Brumbies star had already started matches for the Wallabies at fullback, both centre positions and on the wing.

After starting the 2009 Tri-Nations at fullback, Ashley-Cooper finished the tournament in the centres, occupied the fullback jersey for the four grand slam Tests in the United Kingdom before switching to the wing for this year's inbound internationals.

He admitted to having "no idea" where he would line up for Australia's opening Tri-Nations match against South Africa in Brisbane on Saturday week.

The 26-year-old utility hasn't been hurt by his "Mr Fixit" tag, starting in 34 of his 40 Test appearances.

While relishing the value of his versatility, Ashley-Coper conceded changing positions at short notice was challenging and at times difficult.

He said it was easier to switch between the back three positions than going from that area into the centres.

"Wherever it is, it's always a challenge, just knowing what position you are playing that week," he said.

"It's just addressing each position at training to give you that extra preparation and confidence."

With two other wing options, Digby Ioane and Peter Hynes, unavailable for Australia's Tri-Nations opener, outside backs Drew Mitchell, Lachie Turner, Nick Cummins and Cameron Shepherd are training with the squad this week.

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